Question

29. On heating a liquid
(1) It sublimes
(2) Surface area decreases
(3) Surface area remains the same
(4) Volume generally increases

Give answer with explanation.​

Answer 1

Answer:-

(4) is the correct answer.

Explanation:-

Generally, during heating, the molecules of a liquid start expanding amd eventually resulting in decrease in surface tension. Surface tension is a force which mainly acts on the surface of a liquid.

When, the surface tension decreases, the surface area of the liquid starts increasing. But, when there is excessive heating, the liquid starts converting into vapours.

Why other options are not correct:-

First option can never be correct because sublimation is the process of conversion of solids directly into vapours without the involvement of liquid state.

Second option is also wrong because it js quite absurd that surface area decreases on heating.

Third option is also not correct because when surface tension decreases, the volume can never remain same.

Hence, at last, (1) is the correct option.

Hope I cleared your doubts and provided the quality answer.

Answer 2

Question :-

» On heating a liquid...

1. It sublimes
2. Surface area decreases
3. Surface area remains the same
4. Volume generally increases

Correct Option :-

$ ⟹ $ The correct option for the given question will be (4) Volume generally increases.

Explanation :-

$ ⇢ $ This happens because of the motion of molecules making up the material. When the material is heated, by supplying heat to it, the kinetic energy of the constituent molecules increase.