Question

The Concentration of the two phases in a closed system at the Interphase is

(a) Changes continuously

(b) Never changes

(c) Becomes zero

(d) Increases till the driving force becomes zero

This question was addressed to me in a national level competition.

This is a very interesting question from Interphase Mass Transfer topic in chapter Interphase Mass Transfer of Mass Transfer

Answer 1

Right answer is (b) Never changes

For explanation: The concentration changes only if the component of the two phases added or removed. Generally, Interphase occurs at equilibrium. Once the additional component is added to a system at equilibrium, the concentration changes till it become uniform but it will be differ from the previous.