Assertion(A) : The impurities always decreases surface tension of a liquid
Reason(R) : The change in surface tension of the liquid depends upon the degree contamination of the impurity

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Both assertion(A) and reason(R) are false

Both assertion(A) and reason(R) are true but reason (R) is not the correct explanation of assertion(A)

Assertion (A) is false, reason(R) is true.

Both assertion(A) and reason (R) are true and reason (R) is the correct explanation of assertion(A)

answer is C.

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Detailed Solution

Explanation : The presence of impurities either on the liquid surface or dissolved in it. Considerably affect the force of surface tension, depending upon the degree of contamination. A highly soluble substance like sodium chloride when dissolved in water, increase the surface tension of water. But the sparingly soluble like phenol when dissolved in water reduces the surface tension of water

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