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

A is correct but R is not correct

A is not correct but R is correct

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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