Q. 49

In the following questions a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.

Assertion (A): Liquids tend to have maximum number of molecules at their surface.

Reason (R): Small liquid drops have spherical shape.

(i) Both A and R are true and R is the correct explanation of A.

(ii) Both A and R are true but R is not the correct explanation of A.

(iii) A is true but R is false.

(iv) A is false but R is true.

iv) A is false but R is true.

Answer :

Liquids tend to reduce the number of molecules or their surface tension at their surface because at the surface there are unbalanced attractive forces at the surface of liquid which tends to pull the molecules back into the bulk liquid leaving the minimum number of molecules on the surface or decreasing the surface tension due to this reason or that’s why small drops have spherical shape. So, A is false and R is true.


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