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If we use activities in place of molar concentration in an equilibrium constant expression then what is the dimension of k?

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in Chemistry – Class 11 by (148k points)
If we use activities in place of molar concentration in an equilibrium constant expression then what is the dimension of k?

(a) it becomes dimensionless

(b) the same units of molar concentration

(c) units are related to the activity

(d) cannot predict it

The question was posed to me during an online exam.

This key question is from Law of Chemical Equilibrium and Equilibrium Constant topic in chapter Equilibrium of Chemistry – Class 11

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The correct answer is (a) it becomes dimensionless

Explanation: In equilibrium constant expression of a chemical reaction, (equilibrium constant is represented by the letter K) if the activities are used in place of the molar concentration K becomes dimensionless, that means it has no dimensions.

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