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  4. The active mass of solid is generally taken as

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Q. The active mass of solid is generally taken as

NTA AbhyasNTA Abhyas 2022

Solution:

Active mass is defined as the molar concentration that is number of Gram-moles per litre. Active mass of pure solid/liquid is always $1$ .
Taking of active mass equal to one indicates that concentration of solid does not affect equilibrium constant.