(B) catalyst provides an alternative reaction pathway with a lower activation energy. It increases the rate of both the forward and backward reactions

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Has no effect on equilibrium concentrations

(B) catalyst provides an alternative reaction pathway with a lower activation energy. It increases the rate of both the forward and backward reactions to the same extent. Therefore,it does not change the position of the equilibrium or the equilibrium concentrations of the reactants and products. The correct option is $(B)$.

Class 11 Chemistry 6-1.Equilibrium (Chemical Equilibrium)Equilibrium state and Characteristics of K

Medium

Addition of a catalyst in a system at equilibrium:

A
Increases equilibrium concentrations
B
Has no effect on equilibrium concentrations
C
Decreases equilibrium concentrations
D
Increases the rate of the forward reaction and decreases the rate of the backward reaction