Q.

Assertion (A) : The change in surface tension of a liquid depends upon the degree of contamination of the impurity added to that liquid.
Reason (R) : Impurities added to a liquid always decrease the surface tension of the liquid.

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a

Both A and R are correct and R is the  correct explanation of A

b

A is correct but R is not correct

c

A is not correct but R is correct

d

Both A and R are correct but R is  NOT the correct explanation of A

answer is D.

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Detailed Solution

Impurity added to liquid may increase or decrease surface tension.  Completely soluble impurity increase the surface tension.  Partially soluble and insoluble impurity decreases the surface tension. 

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