Which one of the following statements is 'NOT' True about the angle of contact of a liquid?

Which one of the following statements is 'NOT' True about the angle of contact of a liquid?
  1. Any increase in the temperature of the liquid does not decrease its angle of contact.
  2. If an impurity is added in the liquid then it's angle of contact changes.
  3. Angle of contact depends upon the nature of liquid and solid in contact.
  4. At a given temperature, the angle of contact is constant for a solid-liquid surface.

Solution

The correct option is (A). Concept: Contact angle decreases with the increasing temperature. Addition of impurity decreases the surface tension of liquid. Contact angle depends on the nature of liquid and solid in contact. Therefore, answer (A) is the only "NOT" true statement. Concept based question.

Asked in: MHT CET 2022 (05 Aug Shift 1)

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