The equilibrium constant for a reaction is not affected by the presence of:

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This question was previously asked in

DSSSB PGT Chemistry (Female) Official Paper (Held On: 06 Jul, 2018 Shift 1)

Answer 1

CONCEPT:

Equilibrium Constant and Its Dependence

The equilibrium constant (K) is a measure of the extent of a reaction at equilibrium at a given temperature.
The equilibrium constant depends on the temperature of the system because it is derived from the Gibbs free energy change (ΔG).
The relationship between the equilibrium constant and temperature is given by the van 't Hoff equation.
Other factors, such as pressure, pH, or the presence of a catalyst, do not affect the value of the equilibrium constant directly because K is only a function of temperature.

EXPLANATION:

A catalyst speeds up the rate of both the forward and reverse reactions equally, without altering the equilibrium concentrations of reactants and products.
Since the equilibrium constant (K) depends only on the ratio of the concentrations of the products and reactants at equilibrium, the catalyst has no effect on its value.
Pressure and pH may shift the position of equilibrium (Le Chatelier's Principle), but they do not change the value of K itself.
Temperature, on the other hand, can change the equilibrium constant because it affects the Gibbs free energy (ΔG).

Therefore, the equilibrium constant for a reaction is not affected by the presence of a catalyst.