What is active mass of a pure solid or liquid?

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Q. Assertion :The active mass of pure solid and pure liquid is taken unity. Reason: The active mass of pure solids and liquids depends on the density and molecular mass. The density and molecular of a mass of pure liquids and solids are constant.

Q. Assertion :The active mass of pure solid and pure liquid is taken reactions equally. Reason: The active mass of pure solids and liquids depends on density and molecular mass. The density and molecular mass of pure liquids and solids are constant.

Q. Why active mass of pure solid is taken as one whereas other is not?

The active masses of pure solid or liquid phasesare not included in theexpression of equilibrium constant as:
a)solid and liquid concentrations are independent of their quantities
b)solids and liquids react very slowly
c)solids and liquids at equilibrium do not interact with gaseous phase

d)the molecules of solids and liquids do not migrate to the gaseous phase

The active masses of pure solid or liquid phasesare not included in the expression of equilibrium constant as:
a)solid and liquid concentrations are independent of their quantities
b)solids and liquids react very slowly
c)solids and liquids at equilibrium do not interact with gaseous phase

d)the molecules of solids and liquids do not migrate to the gaseous phase

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