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Surface Tension

Assertion A :...

Question

Assertion (A) : Hot soap solution is preferred for washing dirty clothes.
Reason (R): Surface tension of soap solution decreases on heating.

A

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

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B

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

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C

Assertion (A) is true, but the Reason (R) is false.

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D

Assertrion (A) is false, but the Reason (R) is true.

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Solution

The correct option is A Both Assertion (A) and Reason (R) are true and the Reason (R) is correct explanation of the Assertion(A) .
On increasing temperature surface tension of soap solution decrease because force of attraction between soap molecules decrease.
Thus hot water colleases with mare dirt particles and is used to wash dirty clothes.

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