Chemistry Tricks Of Non-Metals and Their Compounds For NDA

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Tricks Of Non-Metals and Their Compounds For NDA

Hydrogen and It's Properties

Q 1737156982

Which of the following statements is correct?
NCERT Exemplar

(This question may have multiple correct answers)

(A) Metallic hydrides are deficient of hydrogen

(B) Metallic hydrides conduct heat and electricity

(D) Ionic hydrides are very good conductors of electricity in solid state

Solution:

The ionic hydrides are crystalline, non-volatile and non-conducting in solid state. However,
their molten state conduct electricity.

Correct Answer is `=>` (A)

Q 2828412301

The radioactive isotope of hydrogen is

(A)

hydrogen

(B)

parahydrogen

(C)

deuterium

(D)

tritium

Solution:

The ionic hydrides are crystalline, non-volatile and non-conducting in solid state. However,
their molten state conduct electricity.

Correct Answer is `=>` (D) tritium

Q 2838412302

Hydrogen was discovered by

(A)

Lavoisier

(B)

Cavendish

(C)

Dalton

(D)

Newton

Solution:

The ionic hydrides are crystalline, non-volatile and non-conducting in solid state. However,
their molten state conduct electricity.

Correct Answer is `=>` (B) Cavendish

Q 2848412303

Tritium is composed of

(A)

one proton, one electron and two neutrons

(B)

one proton, two electrons and one neutron

(C)

two protons and one electron

(D)

one proton, one electron and one neutron

Solution:

The ionic hydrides are crystalline, non-volatile and non-conducting in solid state. However,
their molten state conduct electricity.

Correct Answer is `=>` (A) one proton, one electron and two neutrons

Q 1787056887

Hardness of water may be temporary or permanent. Permanent hardness
is due to the presence of
NCERT Exemplar

(This question may have multiple correct answers)

(A) chlorides of Ca and Mg in water

(B) sulphates of Ca and Mg in water

(D) carbonates of alkali metals in water

Solution:

Permanent hardness is due to the presence of soluble salts of magnesium and calcium in
the form of chlorides and sulphates in water. Permanent hardness is not removed by boiling

Correct Answer is `=>` (A)

Q 2858412304

Select the true statement .

(A)

Among protium, deuterium and tritium, protium has largest atomic radius

(B)

Absolutely pure ortho hydrogen is formed at 20 K

(C)

Atomic weight of deuterium is 3 and that of hydrogen is 2

(D)

Para and ortho hydrogen possess same chemical properties

Solution:

Permanent hardness is due to the presence of soluble salts of magnesium and calcium in
the form of chlorides and sulphates in water. Permanent hardness is not removed by boiling

Correct Answer is `=>` (D) Para and ortho hydrogen possess same chemical properties

Q 1767856785

Which of the following compounds is used for water softening?
NCERT Exemplar

(A)

`Ca_3(PO_4)_ 2`

(B)

`Na_3PO_4`

(C)

`Na_6P_6O_(18)`

(D)

`Na_2HPO_4`

Solution:

For water softening, sodium hexametaphosphate is used. The chemical formula is

`Na_2[Na_4(PO_3)_6] = Na_6P_6O_(18)` . The trade name is calgon

`undersettext(from hard water)(2CaCl_2) + undersettext(sodium hexametaphosphare) (Na_2[Na_4(PO_3)_6]) -> undersettext(Complex salt soluble)(Na_2[Ca_2(PO_3)_6]) + 4NaCl`

Correct Answer is `=>` (C) `Na_6P_6O_(18)`

Q 2868012805

Hydrogen is not obtained when zinc reacts with

(A)

cold water

(B)

dil. `H_2SO_4`

(C)

dil. `HCl`

(D)

hot 20 % `NaOH`

Correct Answer is `=>` (A) cold water

Q 1747856783

Which of the following ions will cause hardness in water sample?
NCERT Exemplar

(A)

`Ca^( 2+)`

(B)

`Na^+`

(C)

`Cl^-`

(D)

`K^+`

Solution:

Bicarbonates, chlorides and sulphates of Ca and Mg are responsible for the hardness
of water

Note Hard water forms scum/precipitate with soap. Soap containing sodium stearate
`(C_(17)H_(35)COONa)` reacts with hard water to precipitate out `Ca//Mg` stearate.

`2C_(17)H_(35)COONa(aq) +M^(2+)(aq) -> (C_(17)H_(35)COO)_2Mdownarrow+2Na^(+)(aq)` (where `M= Ca//Mg`)

It is unsuitable for laundry and boilers

Correct Answer is `=>` (A) `Ca^( 2+)`

Q 2888012807

Zinc react with cone. `H_2SO_4` to form

(A)

`ZnSO_4+H_2`

(B)

`ZnSO_4`

(C)

`ZnSO_4+SO_2+H_2O`

(D)

None of the above

Correct Answer is `=>` (C) `ZnSO_4+SO_2+H_2O`

Q 2818012809

Hydrogen is collected

(A)

over water

(B)

over mercury

(C)

over alcohol

(D)

None of these

Correct Answer is `=>` (A) over water

Q 2868112905

Consider the following statements about ortho or para forms of hydrogen.
I. Ortho or para hydrogens are isotopes of hydrogen.
II. Specific heats of the two forms are same.
III. Chemical properties of two forms are same.
IV. Boiling points of two forms are same.
Which of these is/are correct statements?

(A)

I and II

(B)

only III

(C)

Ill and IV

(D)

IV and I

Correct Answer is `=>` (B) only III

Q 2878112906

When hydrogen is passed over Pd, hydrogen is adsorbed over the surface of Pd, this process is called

(A)

hydrogenation

(B)

occulusion

(C)

evaporation

(D)

halogenation

Correct Answer is `=>` (B) occulusion

Q 2808112908

Which one of the following elements is used as catalyst in the hydrogenation of vegetable oils?

(A)

(B)

(C)

(D)

Correct Answer is `=>` (A) Pt

Q 2818123000

Dihydrogen reacts with `CO` at `700 K` in the presence of a catalyst to form methanol, the catalyst is

(A)

`ZnO * C_2 O_3`

(B)

`ZnO * C_2 O_4`

(C)

`ZnO * CrO`

(D)

`ZnO * Cr_2O_3`

Correct Answer is `=>` (D) `ZnO * Cr_2O_3`

Q 2838123002

Nascent hydrogen consists of

(A)

Hydrogen atom with excess of energy

(B)

Hydrogen ions in excited state

(C)

hydrogen molecule with excess of energy

(D)

solvated proton

Correct Answer is `=>` (A) Hydrogen atom with excess of energy

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I :In the reaction between `Na` and `H_2`, hydrogen behave like an oxidising agent.
Statement II :Hydrogen atom accepts an electron.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (A) Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

Q 2858012804

Moist hydrogen cannot be dried over cone. `H_2SO_4` because

(A)

it can catch fire

(B)

it is reduced by `H_2SO_4`

(C)

it is reduced by `H_2SO_4`

(D)

it decomposes by `H_2SO_4`

Correct Answer is `=>` (A) it can catch fire

Q 2868412305

The metal which cannot liberate hydrogen from acid is

(A)

platinum

(B)

silver

(C)

Gold

(D)

All of these

Correct Answer is `=>` (D) All of these

Q 2878412306

Hydrogen from `HCl` can be prepared from

(A)

copper

(B)

phosphorus

(C)

magnesium

(D)

mercury

Correct Answer is `=>` (C) magnesium

Q 2888412307

Hydrogen acts as a

(A)

reducing agent

(B)

oxidising agent

(C)

both reducing and oxidising agent

(D)

neither reducing nor oxidising agent

Correct Answer is `=>` (C) both reducing and oxidising agent

Q 2808412308

Hydrogen will not reduce heated

(A)

`CuO`

(B)

`Fe_2O_3`

(C)

`Al_2O_3`

(D)

`SnO_2`

Correct Answer is `=>` (C) `Al_2O_3`

Q 2818412309

Which of the following metal adsorb hydrogen?

(A)

`Zn`

(B)

`Pd`

(C)

`Al`

(D)

`K`

Correct Answer is `=>` (B) `Pd`

Q 1757056884

Some of the properties of water are described below. Which of them
is/are not correct?
NCERT Exemplar

(This question may have multiple correct answers)

(A) Water is known to be a universal solvent

(B) Hydrogen bonding is present to a large extent in liquid water

(D) Frozen water is heavier than liquid water

Solution:

There isH-bonding even in frozen state of water, i.e., ice is lighter than liquid water.
The crystalline form of water is ice. At atmospheric pressure, ice crystallises in the hexagonal
form, but at very low temperatures it condenses to cubic form. Density of ice is less than that
of water. Therefore, an ice cube floats on water

Correct Answer is `=>` (C)

Q 2828512401

In Bosch process hydrogen is obtained from

(A)

natural gas

(B)

Water

(C)

water gas

(D)

None of these

Correct Answer is `=>` (C) water gas

Q 2818012800

In Lane process reduction of steam is carried out by heated

(A)

`Ca`

(B)

`Fe`

(C)

`K`

(D)

`Sr`

Correct Answer is `=>` (B) `Fe`

Q 1717056880

Dihydrogen can be prepared on commercial scale by different methods.
In its preparation by the action of steam on hydrocarbons, a mixture of
`CO` and `H_2` gas is formed. It is known as ......... .
NCERT Exemplar

(This question may have multiple correct answers)

(A) water gas

(B) syn gas

(D) industrial gas

Solution:

Dihydrogen can be prepared on commercial scale by different methods. Reaction of steam
on hydrocarbons or coke at high temperatures in the presence of catalyst yield hydrogen.

`C_nH_(2n+2) +nH_2O+2 undersettext(Ni)overset(1270K) -> nCO_2+(2n+1)H_2`

`CH_4(g) +H_2O(g) underset(Ni)overset(1270K) -> CO(g) + 3H_2(g)`

The mixture of `CO` and `H_2` is called water gas. As this mixture of `CO` and `H_2` is used for the
synthesis of methanol and a number of hydrocarbons, it is also called synthesis gas or
'syn gas'.

Correct Answer is `=>` (A)

Q 2858123004

Consider the following types of hydrides
I. Covalent hydride
II. Ionic hydride
III. Metallic hydride
Which of these are formed by hydrogen?

(A)

I and II

(B)

I and III

(C)

II and III

(D)

All of these

Correct Answer is `=>` (D) All of these

Q 2878123006

Ionic hydrides are formed by

(A)

highly electropositive element

(B)

transitional metals

(C)

highly electronegative element

(D)

inner-transitional element

Correct Answer is `=>` (A) highly electropositive element

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Fused lithium hydride liberates hydrogen gas at anode on its electrolysis.
Statement II : In lithium hydride, hydrogen is in negative oxidation state.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (A) Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Hydrogen forms largest number of compounds in chemistry.
Statement II : Hydrogen is the most; abundant element in the universe.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (B) Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

Q 1717345280

Radioactive elements emit a, `alpha` `beta` and `gamma` rays and are characterised by their
half-lives. The radioactive isotope of hydrogen is
NCERT Exemplar

(A)

protium

(B)

deuterium

(C)

tritium

(D)

hydronium

Solution:

The radioactive isotope of hydrogen is tritium. For tritium (n = 3, p = 1 ) , therefore n/p
ratio is 3.

Correct Answer is `=>` (C) tritium

Carbon and It's Compounds

Q 1748745603

Dry ice is
NCERT Exemplar

(A)

solid `NH_3`

(B)

solid `SO_2`

(C)

solid `CO_2`

(D)

solid `N_2`

Solution:

Carbon dioxide can be obtained as a solid in the form of dry ice allowing the liquifiecl
`CO_2` to expand rapidly.

Note Dry ice is also called cardice. IL is obtmned when `CO_2` is cooled under pressure
(50-60 atm). Dry ice is used for making cold baths in the laboratory by mixing it
with volatile organic solvems. It is also used as a coolant for preserving perishable
articles food Industry, curing local burns and in hospitals for surgcal operation
of sores.

Correct Answer is `=>` (C) solid `CO_2`

Q 2888323207

Carbon forms large number of compounds because it has

(A)

hardness

(B)

catenation property

(C)

tetravalen structure

(D)

variable valency

Correct Answer is `=>` (B) catenation property

Q 2828423301

The nature of chemical bonds in diamond is

(A)

ionic

(B)

covalent

(C)

coordinate bond

(D)

metallic

Correct Answer is `=>` (B) covalent

Q 2060201115

Thermodynamically the most stable form of
carbon is
Class 11 Exercise 11 Q.No. 36

(A)

diamond

(B)

graphite

(C)

full erenes

(D)

coal

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) graphite

Q 2828134001

Diamond and graphite both are made of carbon atoms. Diamond' is extremely hard whereas graphite is soft.. This is because

(A)

the chemical bonds between any two carbon atoms in diamond are stronger

(B)

diamond is ionic whereas graphite is covalent

(C)

each carbon atom in diamond is chemically bonded to a greater number of neigllbouring carbon atoms

(D)

certain atoms in diamond are smaller in size

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (C) each carbon atom in diamond is chemically bonded to a greater number of neigllbouring carbon atoms

Q 2808134008

What happens when steam is passed over red hot carbon'?

(A)

`CO_2+H_2` are formed

(B)

`H_2+O_2`+ steam are formed

(C)

`CO+H_2` are formed

(D)

None of the above

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (C) `CO+H_2` are formed

Q 2878234106

The most reactive form of carbon is

(A)

diamond

(B)

graphite

(C)

coal

(D)

charcoal

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (D) charcoal

Q 2848334203

Which one of the following oxide of carbon is most stable?

(A)

`CO`

(B)

`C_3O_2`

(C)

`CO_2`

(D)

`CO_3`

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (C) `CO_2`

Q 2858334204

Drikold is

(A)

carbon dioxide

(B)

carbon monoxide

(C)

carbon suboxide

(D)

water

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (A) carbon dioxide

Q 2888734607

Which one of the following statement is not correct?

(A)

Carbon dioxide is heavier than air

(B)

The solubility of carbon dioxide decreases with increase in pressure

(C)

Carbon monoxide reduces metal oxides to metal

(D)

Carbon monoxide is used in the manufacture of methanol

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) The solubility of carbon dioxide decreases with increase in pressure

Q 2818834700

Compound formed on heating `CO` with `NaOH` under pressure is

(A)

sodium carbide

(B)

sodium formate

(C)

sodium acetate

(D)

sodium oxalate

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) sodium formate

Q 2848834703

Carbon dioxide can oxidise

(A)

red hot iron

(B)

red hot carbon

(C)

red hot silver

(D)

red hot lead

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) red hot carbon

Q 2858834704

A gas which reacts with `CaO` not with `NaHCO_3` is

(A)

`CO_2`

(B)

`Cl_2`

(C)

`O_2`

(D)

`N_2`

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (A) `CO_2`

Q 2888834707

Dry ice is used for making cold-baths in laboratories by mixing with volatile organic solvents. Identify the form of dry ice from the following.

(A)

Gaseous carbon dioxide

(B)

Liquid carbon dioxide

(C)

Solid carbon dioxide

(D)

Solid hydrogen oxide

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (C) Solid carbon dioxide

Q 2808834708

Identify the correct statement

(A)

Carbogen is an antidote for carbon monoxide poisoning

(B)

Foamite fire extinguisher contains solutions of aluminium sulphate and baking soda

(C)

Dry powder extinguisher contain sand and baking soda

(D)

All of the above

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (D) All of the above

Q 2888034807

Consider the following statements with regard to diamond and graphite.
I. Diamond and graphite are isotopes of carbon.
II. In diamond each carbon atom is `sp^3` - hybridised whereas in graphite each carbon atom is `sp^2` - -hybridised.
III. C--C bond length in diamond is greater than that in graphite.
IV. Graphite is less reactive than diamond.
Which of these statements are correct'?

(A)

I and II

(B)

II and Ill

(C)

III and IV

(D)

II and IV

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) II and Ill

Q 2828134901

Which of the following statements about diamond are correct?
I. It is used as a gem in jewellery because of its ability to reflect light.
II. It is a good conductor of electricity.
III. It is used for cutting glass. marble, stones and other hard materials.
IV. It is used for drilling of rocks .. Select the correct answer using the codes given below.

(A)

I , II and IV

(B)

II , III and IV

(C)

I , II and III

(D)

II and IV

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (A) I , II and IV

Q 2848134903

Consider the following statements regarding diamond.
I. It is an allotrope of silicon.
II. It is a bad conductor of heat and electricity.
III. It is the hardest substance.
IV. It bums to produce carbon dioxide.
Which of the statements given above are correct?

(A)

I , III and IV

(B)

II , III and IV

(C)

I and II

(D)

All of these

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) II , III and IV

Q 2808134908

Following statements are made in connection with carbon dioxide `CO_2`
I. `CO_2` is a poisonous gas.
II. `CO_2` is an acidic oxide.
III. `CO_2` turns lime water· milky.
Which of the statements given above is/are correct?

(A)

I and II

(B)

II and Ill

(C)

only III

(D)

I and III

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) II and Ill

Q 2848145903

Following statements are made in Connection with carbon dioxide `(CO_2)`.
I. Carbon dioxide is prepared by burning carbon or by the reaction of a carbonate and an acid or by decomposition of lime stone.
II. In all these methods of preparation of `CO_2` , the elements carbon and oxygen are available in a fixed ratio `3 : 8.`
III. When `CO_2` is continuously bubbled through lime water, initially lime water turns milky and then again colourless.
Which of the statements given above is/are correct?

(A)

I and III

(B)

II and Ill

(C)

I and Ill

(D)

All of these

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (D) All of these

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Diamond is used as a precious stone.
Statement II : In diamond carbon atoms are tetrahedrally arranged.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) Both the statements are true but Statement II is not the correct explanation of Statement I.

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Diamond is very hard and has high melting point
Statement II : In diamond, each carbon is covalently bonded to four other carbon atoms to form a three-dimensional network.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (A) Both the statements are true and Statement II is the correct explanation of Statement I

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Carbon can form more compounds than any other element
Statement II :Carbon can exist in various allotropes.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) Both the statements are true but Statement II is not the correct explanation of Statement I.

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : `CO` is neutral but `CO_2` is an anhydride of carbonic acid.
Statement II : `CO_2` dissolves in `H_2O` forming carbonic acid.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) Both the statements are true but Statement II is not the correct explanation of Statement I.

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Carbon dioxide turns lime water milky.
Statement II : Calcium carbonate is insoluble in water

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (A) Both the statements are true and Statement II is the correct explanation of Statement I

Q 2818145909

Match the list I with list II and select the correct answer using the codes given below the list.

List I		List II
(A)	`CO_2`	(1)	Fermentation
(B)	Zymase	(2)	Non-metal
(C)	Carbon	(3)	Fire extinguishing
(D)	`CaCO_3`	(4)	Chalk

(A)

`A → 2 , B → 3 , C → 1 , D → 4`

(B)

`A → 3 , B → 1 , C → 2 , D → 4`

(C)

`A → 1 , B → 3 , C → 4 , D → 2`

(D)

`A → 4 , B → 2 , C → 1 , D → 3`

Solution:

Thermodynamically the most stable form of
carbon is graphite, i.e., option (b) is correct.

Correct Answer is `=>` (B) `A → 3 , B → 1 , C → 2 , D → 4`

Q 1728156001

Which of the following statements are correct ?
NCERT Exemplar

(This question may have multiple correct answers)

(A) Fullerenes have dangling bonds

(B) Fullerenes are cage-like molecules

(D) Graphite is slippery and hard and therefore used as a dry lubricant in machines

Solution:

Fullerene an allotrope of carbon with finite number of carbon atoms with closed cage
structure has been identified. The C60 isotope is more dominants. The structure is nearly
spherical, like football.
Sphere is formed by the combination of 20 hexagons and 12 pentagons. Graphite is
thermodynamically more stable than all allotropes of carbon

Correct Answer is `=>` (B)

Q 2848523403

The inert form of carbon is

(A)

diamond

(B)

graphite

(C)

coal

(D)

charcoal

Correct Answer is `=>` (A) diamond

Q 2818623500

Diamond is a

(A)

good conductor and soft

(B)

non-conductor and soft

(C)

non-conductor and hard

(D)

good conductor and hard

Correct Answer is `=>` (C) non-conductor and hard

Q 2858623504

Lead pencil contains

(A)

lead sulphate

(B)

lead

(C)

ferrous sulphate

(D)

graphite

Correct Answer is `=>` (D) graphite

Q 2878623506

Distance between two layers of carbon atoms in graphite is

(A)

335 pm

(B)

154 pm

(C)

5 33 pm

(D)

None of these

Correct Answer is `=>` (A) 335 pm

Q 2818623509

Graphite is used in nuclear reactor

(A)

as a lubricant

(B)

as a fuel

(C)

for lining the inside of the reactor as insulator

(D)

for reducing the velocity of neutrons

Correct Answer is `=>` (D) for reducing the velocity of neutrons

Q 2888723607

Difference between diamond and graphite is that

(A)

graphite combines with oxygen to form carbon dioxide but diamond does not

(B)

the atoms in each have dilferent masses

(C)

the crystal structure in diamond is different form that in graphite

(D)

All of the above

Correct Answer is `=>` (C) the crystal structure in diamond is different form that in graphite

Q 2828434301

Fixation of carbon dioxide by plants is called

(A)

photosynthesis

(B)

fermentation

(C)

respiration

(D)

burning of oxygen

Correct Answer is `=>` (A) photosynthesis

Q 2838434302

Dry powder extinguishers contain

(A)

sand

(B)

sand + `Na_2CO_3`

(C)

sand + banking soda

(D)

sand and `K_2CO_3`

Correct Answer is `=>` (C) sand + banking soda

Q 2828734601

Carbon dioxide is not used as a fire extinguisher in fire caused by

(A)

metal

(B)

non-metal

(C)

acids

(D)

None of the above

Correct Answer is `=>` (C) acids

Q 2838734602

Which one of the following is a linear molecule?

(A)

`H_2O`

(B)

`CO_2`

(C)

`N_2O_3`

(D)

`NO_2`

Correct Answer is `=>` (B) `CO_2`

Q 2848734603

Which of the following is decomposed on heating?

(A)

`Na_2CO_3`

(B)

`Li_2CO_3`

(C)

Both (a) and (b)

(D)

None of the above

Correct Answer is `=>` (C) Both (a) and (b)

Q 2868334205

Soda water contains

(A)

formic acid

(B)

sulphuric acid

(C)

carbonic acid

(D)

acetic acid

Correct Answer is `=>` (C) carbonic acid

Q 2808334208

An anhydride of carbonic acid is

(A)

`CO`

(B)

`C_3O_2`

(C)

`CO_2`

(D)

None of these

Correct Answer is `=>` (C) `CO_2`

Q 2858734604

Carbogen is a mixture of

(A)

oxygen + carbon dioxide

(B)

oxygen + chlorine

(C)

oxygen + carbon monoxide

(D)

None of the above

Correct Answer is `=>` (A) oxygen + carbon dioxide

Q 2868734605

Pick up the false statement.

(A)

Solid `CO_2` is known as drikold

(B)

Dry ice is used as a refrigerant

(C)

Dry ice sublimes on heating

(D)

Dry ice is covalent solid

Correct Answer is `=>` (A) Solid `CO_2` is known as drikold

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Graphite behaves as a lubricant
Statement II :The layers of carbon atoms in graphite can slip past one over another.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (A) Both the statements are true and Statement II is the correct explanation of Statement I

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Graphite is more reactive than diamond.
Statement II : Graphite has a two dimensional sheet like structure. where the adjacent layers are held by weak van der waals' forces.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (B) Both the statements are true but Statement II is not the correct explanation of Statement I.

Q 2878145906

Following questions consist of two statements labelled as Statement I and Statement II. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Diamond, graphite and charcoal when burnt in oxygen change to Carbon dioxide
Statement II : Chemical properties of the elements in solid state depends upon the arrangement of atoms.

(A)

Both the statements are true and Statement II is the correct explanation of Statement I

(B)

Both the statements are true but Statement II is not the correct explanation of Statement I.

(C)

Statement I is true, but Statement II is false

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (C) Statement I is true, but Statement II is false

Q 2848423303

Carbon atoms in diamond are bonded with each other in which configuration

(A)

Planar

(B)

Linear

(C)

Octahedral

(D)

Tetrahedral

Correct Answer is `=>` (D) Tetrahedral

Q 2888423307

Use of diamand as a gem depend upon its

(A)

high cost

(B)

refractive index

(C)

extreme hardness

(D)

bad conductance

Correct Answer is `=>` (B) refractive index

Q 2838034802

Which is the correct representation of the reaction when steam is passed over red hot coke at `1000^0C`?

(A)

`C+2H_2O → CO+H_2`

(B)

`C+2H_2O → CO_2+2H_2O`

(C)

`2H_2O → 2H_2+O_2`

(D)

None of the above

Correct Answer is `=>` (A) `C+2H_2O → CO+H_2`

Q 2868034805

Suppose you have to determine the percentage of carbon dioxide in a sample of a gas available in a container. Which of the following would be the best absorbing material for the carbon dioxide?

(A)

Cold, solid calcium hydroxide

(B)

Cold solid calcium chloride

(C)

Heated copper oxide

(D)

Heated charcoal

Correct Answer is `=>` (D) Heated charcoal

Q 2828156001

Match the list I with list II and select the correct answer using the codes given below the list..

List I		List II
(A)	Marble	(1)	Formation of urea
(B)	Hydrated `CO_2`	(2)	`KOH`
(C)	`CO_2` absorbs	(3)	`H_2CO_3`
(D)	Use of `CO_2`	(4)	`CaCO_3`

(A)

`A →4 , B → 3, C → 2 , D → 1`

(B)

`A →4 , B → 2 , C → 3 , D → 1`

(C)

`A → 1 , B → 2 , C → 3 , D → 4`

(D)

`A → 1 , B → 3 , C → 2 , D → 1`

Correct Answer is `=>` (A) `A →4 , B → 3, C → 2 , D → 1`

Q 2808734608

Conversion of glucose into ethanol is called

(A)

formylation

(B)

fermentation

(C)

conversion

(D)

photosynthesis.

Correct Answer is `=>` (B) fermentation

Micro Crystalline Forms of Carbon

Q 2838134002

The variety of coal having the highest carbon content is

(A)

anthracite

(B)

bituminous

(C)

lignite

(D)

peal

Correct Answer is `=>` (A) anthracite

Q 2858134004

The variety of coal having the lowest carbon content is

(A)

peal

(B)

lignite

(C)

bituminous

(D)

anthracite

Correct Answer is `=>` (A) peal

Q 2818234100

Activated charcoal is employed to remove colouring matter from pure substance it works by

(A)

bleaching

(B)

oxidation

(C)

reduction

(D)

adsorption

Correct Answer is `=>` (D) adsorption

Q 2888234107

Charcoal is activated by treating with

(A)

steam in retort

(B)

super heated water

(C)

hot air

(D)

None of the above

Correct Answer is `=>` (A) steam in retort

Q 2808234108

Coke is obtained from wood by

(A)

cracking

(B)

destructive distillation

(C)

fractional distillation

(D)

None of the above

Correct Answer is `=>` (B) destructive distillation

Q 2818234109

Coal gas is a mixture of

(A)

`H_2` and `CO`

(B)

`H_2 , CO` and `CH_4`

(C)

`H_2O` and `CO`

(D)

`CO` and `CH_4`

Correct Answer is `=>` (B) `H_2 , CO` and `CH_4`

Q 2878134906

Crude oil is a direct source of
I. Asphalt
II. Paraffin wax
III. Fatty acids
IV. Gas oil
Which of the above are correct'?

(A)

I and II

(B)

II and Ill

(C)

I and IV

(D)

I , II and IV

Correct Answer is `=>` (D) I , II and IV

Q 2838234102

Formation of coal from wood is

(A)

adsorption

(B)

carbonisation

(C)

decarboxylation

(D)

None of these

Correct Answer is `=>` (B) carbonisation

Q 2868234105

The charcoal used to decolourise brown sugar solution is

(A)

wood charcoal

(B)

coconut charcoal

(C)

animal charcoal

(D)

sugar charcoal

Correct Answer is `=>` (C) animal charcoal

Q 2818334200

Producer gas is a mixture of

(A)

air and water

(B)

`CO , H_2` and `N_2`

(C)

`CO` and `N_2`

(D)

`CO` and `H_2`

Correct Answer is `=>` (C) `CO` and `N_2`

Q 2828334201

Which has the highest calorific value?

(A)

Coal gas

(B)

Coal

(C)

Producer gas

(D)

`CO_2`

Correct Answer is `=>` (A) Coal gas

Q 2838334202

Maximum calorific value is of

(A)

peat

(B)

lignite

(C)

bituminous

(D)

anthracite

Correct Answer is `=>` (D) anthracite

Oxygen and It's Compounds

Q 2888156007

Oxygen is obtained by heating

(A)

ammonium dichromate

(B)

sodium peroxide

(C)

potassium permangnate

(D)

green vitriol

Correct Answer is `=>` (B) sodium peroxide

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Oxygen is oxidised on combination with fluorine.
Statement II :Fluorine is more electronegative element than oxygen.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (A) Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Oxygen is paramagnetic.
Statement II :Hydride of oxygen is less volatile than that of sulphur.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (B) Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

Q 2818223109

Which is the most abundant element in earth's crust?

(A)

`Ca`

(B)

`C`

(C)

`Si`

(D)

`O`

Correct Answer is `=>` (D) `O`

Q 2808156008

The molecule having two unpaired electrons is

(A)

`CO`

(B)

`NO`

(C)

`CN`

(D)

`O_2`

Correct Answer is `=>` (D) `O_2`

Q 2838156002

Oxygen was discovered by

(A)

Priestley

(B)

Boyle

(C)

Scheele

(D)

Canvendish

Correct Answer is `=>` (A) Priestley

Q 2858156004

Gases respectively absorbed by the alkaline pyrogallol and oil of cinnamon are

(A)

`O_3 , CH_4`

(B)

`O_2 , O_3`

(C)

`SO_2 , CH_4`

(D)

`Na_2O , O_3`

Correct Answer is `=>` (B) `O_2 , O_3`

Q 2868156005

`O_2` molecule is paramagnetic in

(A)

solid state

(B)

liquid state

(C)

gaseous state

(D)

All of these

Correct Answer is `=>` (D) All of these

Q 2838256102

Ozone is the name given to

(A)

ozonised oxygen

(B)

`Na_2O_2`

(C)

`KO_2`

(D)

pyrogallol

Correct Answer is `=>` (A) ozonised oxygen

Q 2848256103

Oxygen and ozone are

(A)

allotropes

(B)

isomers

(C)

isotopes

(D)

isobars

Correct Answer is `=>` (A) allotropes

Q 2818156009

Which of the following is neutral oxide?

(A)

`H_2O_2`

(B)

`Na_2O`

(C)

`NO`

(D)

`PbO`

Correct Answer is `=>` (C) `NO`

Q 2828256101

Which one is known as oil of vitriol?

(A)

`H_2 S_2 O_3`

(B)

`H_2SO_4`

(C)

`H_2SO_5`

(D)

`H_2S_2O_8`

Correct Answer is `=>` (B) `H_2SO_4`

Q 2858256104

`B_2O_3` is

(A)

acidic

(B)

basic

(C)

neutral

(D)

amphoteric

Correct Answer is `=>` (A) acidic

Q 2888256107

Which of the following statements are true regarding oxygen?
I. It reacts with non-metals to form oxides, which are basic in nature.
II. Ozone is an allotrope of oxygen.
III. It is soluble in acidic pyrogallol.
IV. It is slightly heavier than air.

Select the correct answer using codes given below

(A)

I and III

(B)

II and IV

(C)

III and IV

(D)

I and IV

Correct Answer is `=>` (B) II and IV

Q 2868256105

Which one of the following is not a basic oxide ?

(A)

`SiO_2`

(B)

`MgO`

(C)

`Na_2O`

(D)

`CaO`

Correct Answer is `=>` (A) `SiO_2`

Nitrogen and It's Compounds

Q 2065456365

On heating ammonium dichromate and barium azide separately we get
NCERT Exemplar

(A)

`N_2` in both cases

(B)

`N_2` with ammonium dichromate and NO with barium azide

(C)

`N_2 O` with ammonium dichromate and `N_2` with barium azide

(D)

`N_2 O` with ammonium dichromate and `NO_2` with barium azide

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (A) `N_2` in both cases

Q 2808356208

Which one of the following element does not have allotropic forms?

(A)

Oxygen

(B)

Nitrogen

(C)

Sulphur

(D)

Phosphorus

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (B) Nitrogen

Q 2818456300

When ammonia is passed over hot `CuO` it is oxidised to

(A)

`N_2`

(B)

`NO_2`

(C)

`N_2O`

(D)

`HNO_2`

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (A) `N_2`

Q 2848456303

Nitrogen has no d-orbital in its valence shell and therefore it cannot

(A)

exhabit the oxidation state of +5

(B)

have covalency greater than 4

(C)

exhabit orbital hybridisation

(D)

form oxides with oxidation states greater than +3

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (B) have covalency greater than 4

Q 2868556405

The correct order for the increasing acidic strength of oxides of nitrogen is

(A)

`N_2 < NO < N_2O_4 < N_2O_3 < N_2O`

(B)

`NO < N_2O < N_2O_4 < N_2O_5`

(C)

`N_2O < N_2O_3 < N_2O_4 < N_2O_5 < NO`

(D)

`N_2O < NO < N_2O_3 < N_2O_4 < N_2O_5`

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (D) `N_2O < NO < N_2O_3 < N_2O_4 < N_2O_5`

Q 2818656500

The yellow colour of nitric acid can be removed by

(A)

boiling the acid

(B)

bubbling air through the warm acid

(C)

passing ammonia through acid

(D)

adding a little `Mg` powder

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (B) bubbling air through the warm acid

Q 2858656504

Which of the following is obtained when `N_2` reacts with calcium carbide?

(A)

Calcium cyanate

(B)

Calcium acetate

(C)

Calcium cynamide

(D)

Calcium carbonate

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (C) Calcium cynamide

Q 2878656506

The one which does not form pentachloride is

(A)

`N`

(B)

`P`

(C)

`As`

(D)

`Sb`

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (A) `N`

Q 2818656509

Oxidation of `NO` in air produces

(A)

`N_2O`

(B)

`N_2O_3`

(C)

`NO_2`

(D)

`N_2O_5`

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (C) `NO_2`

Q 2838756602

Ammonia can be dried by

(A)

conc. `H_2SO_4`

(B)

`P_4O_(10)`

(C)

`CaO`

(D)

anhydrous `CaCl_2`

Solution:

On heating ammonium dichromate and barium azide it produces N2 gas separately.
`(NH_4 )_2 Cr_2O_7-> N_2 + 4H_2O+ Cr_2O_3`
`Ba(N_3)_2 -> Ba + 3N_2`

Correct Answer is `=>` (C) `CaO`

Q 2075834766

Which of the following elements does not show allotropy?
NCERT Exemplar

(A)

Nitrogen

(B)

Bismuth

(C)

Antimony

(D)

Arsenic

Solution:

Nitrogen does not show allotropy due to its weak N-N single bond. Therefore, ability
of nitrogen to form polymeric structure or more than one structure or form become
less. Hence, nitrogen does not show allotropy.

Correct Answer is `=>` (A) Nitrogen

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I : Nitrogen is an inert diatomic gas with the structure `overset(••)N equiv overset(••)N`
Statement II : The heat of dissociation of `N_2` is extremely large `(954 kJ)`.

(A)

Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

(B)

Both Statement I and Statement II are true but Statement II is not the correct explanation of Statement I

(C)

Statement I is true, but Statement II is false.

(D)

Statement I is false, but Statement II is true.

Correct Answer is `=>` (A) Both Statement I and Statement II are true and Statement II is the correct explanation of Statement I

Q 2818223100

Following questions consist of two statements labelled as Statement 1 and Statement ll. Examine both the statements carefully and mark the correct choice according to the codes given below.
Statement I :Nitrogen is a poisonous gas.
Statement II : Animals die in its atmosphere for want of oxygen.

(A)