MHT CET 2022 Physics question

Which one of the following statement is 'NOT' true about the angle of contact of a liquid?

(A)Any increase in the temperature of the liquid does not decrease its angle of contactCorrect
(B)If an impurity is added in the liquid then it's angle of contact changes
(C)Angle of contact depends upon the nature of liquid and solid in contact
(D)At a given temperature, the angle of contact is constant for a solid-liquid surface

Answer: (A)

Solution

We need the false statement. The angle of contact depends on the nature of the liquid and solid in contact (C true), is constant for a given pair at a given temperature (D true), and changes when impurities (e.g. detergents, solutes) are added because they alter the surface

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Question ID VK-093768