MHT CET 2023 Physics question

By adding soluble impurity in a liquid, angle of contact

(A)decreasesCorrect
(B)increases
(C)remains unchanged
(D)first increases and then decreases

Answer: (A)

Solution

The angle of contact is given by . As per the Std XII textbook, adding a soluble impurity to a liquid (like a detergent) lowers its surface tension and the solid-liquid tension changes so that the liquid wets the solid better, i.e.

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Question ID VK-098265