Question

Q2 Give reason for the following:
(a) Air exhibits nature of fluidity but stone does not.
(b) It is difficult to break iron rod than piece of chalk.
(c) Smell of perfume spreads rapidly in room.​

Answer 1

Answer:

a) a fluid is something that can flow and doesn't have a fixed shape. And attraction between molecules is lesser than that in solids. So as the air doesn't have a fixed shape and the attraction between particles are very less so it exhibit nature of fluidity.

b) First of all we know that iron is a metal abd chalk is a non metal. Attraction between molecular particles in metal is more than that in non metal. And iron is more hard than chalk. So it is difficult to break iron than piece of chalk.

Answer 2

Explanation:

$\huge\bf\underline{a) \: Answer}$

=>The air doesn't have a fixed shape and the attraction between particles are very less so it exhibit nature of fluidity. 

=>But the stone have fixed shape and the attraction between two particles is high. so, it can't exhibit fluidity.

$\huge\bf\underline{b) \: Answer}$

=>A piece of chalk would be easier to break because in chalk the inter molecular forces of attraction are lesser than inter molecular forces in a iron rod.

=>So, A piece of Chalk is easier to break.

$\huge\bf\underline{c) \: Answer}$

=>Smell of perfume spreads rapidly in summer because the intermolecular force between the particles get charged up and starts moving faster than usual due to the heat present in the atmosphere.