It is a negatively charged particle
The mass of electron is equal to the mass of neutron
It is a basic constituent of all atoms
It is a constituent of cathode rays
element
atom
molecule
ion
Crookes
J. J. Thomson
Henry
Rutherford
They start from the cathode and move towards the anode
They travel in straight line in the absence of an external electrical or magnetic field
Characteristics of cathode rays do not depend upon the material of electrodes in cathode ray tube
Characteristics of cathode rays depend upon the nature of gas present in the cathode ray tube
Proton electron alpha particle hydrogen atom
Electron, proton, hydrogen atom, alpha particle
Hydrogen atom. proton. electron, alpha particle
Alpha particle, proton. hydrogen atom electron
Overall neutrality of atom
Spectra of hydrogen atom
Position of electrons, protons and neutrons in atom
Stability of atom
H - atom
`He^+` ion
`Li^(2+)` ions
All of these
`mvr = (n h)/(2pi)`
`mvr = (2pi)/(n h)`
`mvr = (n^2 h^2)/(2pi^2)`
`mvr^2 = (n h)/pi`
Both the statements are true and Statement II is the correct explanation of Statement I
Both the statements are true but Statement II is not the correct explanation of Statement I.
Statement I is true, but Statement II is false
Statement I is false, but Statement II is true.
Most of the space in the atom is empty
The radius of the atom is about`10^(-10)` m while that of nucleus is`10^(-15)` m
Electrons move in a circular path of fixed energy called orbits
Electrons and the nucleus are held together by electrostatic forces of attraction
Energy of the electrons in the orbit is quantised
The electron in the orbit nearest the nucleus has the lowest energy
Electrons revolve in different orbits around the nucleus
The position and velocity of the electrons in he orbit cannot be determined timultaneously
Hund
Thomson
Somrnerfeld
Rutherford
emission of energy takes place
the size of atom increases
absorption of energy takes place
an electron in an atom moves without emission or absorption
Bohr's
de-Broglie
Rutherforcl
Planck's
Name | Frequency | Uses | |||
---|---|---|---|---|---|
(A) | X-rays | (1) | `2 xx 10^16 -3 xx 10^19` Hz | Medical pictures, material testing | |
(B) | Ultraviolet wave (UV) | (1) | `7.9xx10^14 -2xx10^16` Hz | Germisidal lamp | |
(C) | Long radio waves | (1) | `10^0- 10 ^4` Hz | Medical pictures, material testing | |
(D) | Microwave | (1) | `1 xx 10^9 - 5 xx 10^11 ` Hz | Cooking radar |
`6.6xx10^(-32) g//m^2 s`
`6.6xx10^(-34) kgm^2//s`
`6.6xx10^(-33) kg//ms^(-1)`
`6.6xx10^(-34) gs^(-1)`
(This question may have multiple correct answers)
Atomic mass
atomic number
Atomic radius
Atomic volume
`10`
`14`
`12`
`13`
`Na^+ ,Mg^(2+)`
`Al^(3+),O^-`
`Na^+,O^(2-)`
`N^(3-),Cl^-`
He
C
H
N
Mass spectrograph-Chadwick
Atomic number-Moseley
Neutron-Millikan's
Measurement of charge of an electron-Astron
they have same atomic number but different mass number
they have same number of electrons but different number of neutrons
they have same number of neutrons but different number of electrons
sum of the number of protons and neutrons is same but the number of protons is different
`40`
`27`
`14`
`13`
`M^+`
`M^(2+)`
`M^(-)`
`M^(2-)`
1:2
1:1
1 :3
3 : 1
`8`
`6`
`12`
`10`
Number of protons
Number of protons and neutrons
Number of ions
Number of nucleons
I and II
II and Ill
III and IV
I and IV
only I
only II
II and III
All of the above
Isobars possess same chemical properties
Isotopes occupy same position in periodic table
Isotopes possess same atomic number
In isobars the total number of protons and neutrons in the nucleus is same
more than the atomic number of an element
less than the atomic number of an element
more than the number of electrons in the atom
less than the number of electrons in the atom
Pauli's exclusion principle
Heisenberg's uncertainty principle
Hund's rule of maximum multiplicity
Aufbau principle
alurninium
sodium
chorine
magnesium
`Cr^(3+), Fe^(3+)`
`Fe^(3+) ,Mn^(2+)+`
`Fe^(3+), Co^(3+)`
`Sc^(3+), Cr^(3+)`
`1s^2`
`1s^2 , 2s^2 , 2p^6 , 3d^(10) , 3s^2`
`1s^2 , 2s^2 , 2p^6`
`1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 4s^1`
2
4
9
3
`l`
`n` and `l`
`n` and `m`
`m` and `s`
I and II
II and Ill
III and IV
I , II and III
Quantum number | Information provided | ||
---|---|---|---|
(A) | Principal quantum number | (1) | Orientation of the orbital |
(B) | Azimuthal quantum number | (2) | Energy and size of orbital |
(C) | Magnetic quantum number | (3) | Spin of electron |
(D) | Spin quantum number | (4) | Shape of the orbital |
(This question may have multiple correct answers)
Pauli's exclusion principle
Heisenberg's uncertainty principle
Aufbau principle
de-Broglie principle
`1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 3d^4 , 4s^2`
`1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 3d^5 , 4s^1`
`1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 4s^2 , 4p^4`
`1s^2 , 2s^2 , 2p^6 , 3s^2 , 3p^6 , 3d^6`
Column I (Electronic configuration) | Column II (Elements) | ||
---|---|---|---|
(A) | `1s^2` | (1) | Chlorine |
(B) | `1s^2 , 2s^2 , 2p^6` | (2) | Fluoride ion |
(C) | `1s^2 , 2s^2 , 2p^6 , 3s^2` | (3) | Hydride ion |
(D) | `1s^2 , 2s^2 , 2p^6 , 3s^2, 3p^5` | (4) | Magnesium |
`A → 3 , B → 2 , C → 4 , D → 1`
`A → 3 , B → 4 , C → 2 , D → 1`
`A → 4 , B → 2 , C → 1 , D → 3`
`A → 2 , B → 3 , C → 4 , D → 1`
Rules | Statement | ||
---|---|---|---|
(A) | Hund's Rule | (1) | No two electrons in an atom can have the same set of four quantum numbers. |
(B) | Aufbau Principle | (2) | Half-filled and completely filled orbitals have extra stability. |
(C) | Pauli Exclusion Principle | (3) | Pairing of electrons in the orbitals belonging to the same subshell does not take place until each orbital is singly occupied. |
(D) | Heisenberg's Uncertainty Principle | (4) | It is impossible to determine the exact position and exact momenturn of a subatomic particle simultaneously. |
(5) | In the ground state of atoms, orbitals are filled in the order of their increasing energies |
short range 'weak interaction
short range 'strong interaction
long range 'electromagnetic interaction'
long range 'gravitational'
Both the statements are true and Statement II is the correct explanation of Statement I
Both the statements are true but Statement II is not the correct explanation of Statement I.
Statement I is true, but Statement II is false
Statement I is false, but Statement II is true.
exactly the same number of neutrons and protons
more neutrons that protons
no neutrons
no protons
Both the statements are true and Statement II is the correct explanation of Statement I
Both the statements are true but Statement II is not the correct explanation of Statement I.
Statement I is true, but Statement II is false
Statement I is false, but Statement II is true.
`5\ min^-1`
`0.5\ min^-1`
`0.05\ min^-1`
`0.005\ min^-1`
`1.00 xx 10^-5 yr^-1`
`1.00 xx 10^(-4) yr^(-1)`
`1.00 xx 10^(-3) yr^(-1)`
`1.00 xx 10^-3 yr^-1`
Graphite
Cadmium
Boron
Uranium