Solution:

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Solution:

The correct order of compressibility is Solid < Liquid < Gas.

Gases are highly compressible as compared to

solids and liquids. In gas, the molecules have enough

kinetic energy so that the effect of intermolecular

forces is small and the typical distance between

neighbouring molecules is much greater than the

molecular size.

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Solution:

The word 'stormy' describes weather conditions like thunder, lightening, dark clouds, wind and pelting rain. This is the only option given in the question that indicates a sudden fall in barometer reading.

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Solution:

In normal situations, the air inside your ear is at the same pressure as the air outside your ear. This means that the force on the two sides of the ear drum are the same and you are happy. But what if you go underwater? In this case, there is water on the outside of this ear drum, but air on the inside. If you don't do anything, the pressure inside will still be at atmospheric pressure. However, on the outside, the pressure will be greater. This means that the force from the inside air will not cancel with the pressure from the outside. Your ear drum doesn't want to accelerate, so it stretches like a spring to produces a net force of zero. This stretching of the ear drum hurts

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Solution:

In normal situations, the air inside your ear is at the same pressure as the air outside your ear. This means that the force on the two sides of the ear drum are the same and you are happy. But what if you go underwater? In this case, there is water on the outside of this ear drum, but air on the inside. If you don't do anything, the pressure inside will still be at atmospheric pressure. However, on the outside, the pressure will be greater. This means that the force from the inside air will not cancel with the pressure from the outside. Your ear drum doesn't want to accelerate, so it stretches like a spring to produces a net force of zero. This stretching of the ear drum hurts

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Solution:

According to law of definite proportion, a chemical compound is always found to be made up of the same element combined together in the same fixed proportion by mass.

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Solution:

According to law of combining volumes, "When gases
react together, they always do so in volumes which bear a simple
ratio to one another and to the volumes of the products" This is
also known as Gay-Lussac's law of gaseous volumes.

e.g. `underset(1 vol)(H_2g)+ underset(1 vol)(Cl_2(g))-> underset(2 vol)(2HCl(g))`

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Solution:

In a compound, the valency of an element
(electropositive element) is written as subscript of other element
(electronegative element) and vice-versa. Hence,

ln `Ga_2O_ 3`,

Valency of `Ga = + 3`

Valency of `O = -2`

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Solution:

Compound is a pure substance containing two or more
elements in a fixed ratio by mass. Carbon dioxide (`CO_2` ) is a
colourless gas. In `CO_2`

Mass of carbon `= 12 g`

Mass of oxygen `= 2 xx 16= 32`

`(text(Mass of carbon))/(text(Mass of oxygen))=12/32=3/8`

`:.` Carbon and oxygen combine together in the ratio of `3 : 8` by
mass in `CO_2`, hence !I is a compound.

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Solution:

Law of multiple proportions explains the formation of `CO` and `CO_2` from `C` and `O`. According to this law, if two elements combine in different ways to form different substances, their mass ratio are small whole number multiples of each other.

Thus, `(C : O text(mass ratio in CO))/(C : O text(mass ratio in )CO_2)=(12:16)/(12:32)=2`

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