JEE Main 2025 Jan 29 Shift 2, Chemistry Q6: Factors Affecting Equilibria

JEE Main2025Jan 29, Shift 2Chemistry

Consider the equilibrium

$C O (g) + 3 H_{2} (g) ⇌ C H_{4} (g) + H_{2} O (g)$

If the pressure applied over the system increases by two fold at constant temperature then

(A) Concentration of reactants and products increases.

(B) Equilibrium will shift in forward direction.

(D) Equilibrium constant remains unchanged as concentration of reactants and products remain same.

Choose the correct answer from the options given below :

Solution

Change in gaseous moles: $Δ n_{g} = (1 + 1) - (1 + 3) = - 2$ . Doubling pressure compresses the system, so:

(A) True: Compression raises the concentration of every gaseous species in the mixture.

(B) True: Le Chatelier's principle pushes the equilibrium toward the side with fewer moles of gas, which is the product side.

(C) False: The equilibrium constant depends only on temperature, not on pressure or concentration.

(D) False: Although $K$ is unchanged, the concentrations themselves do shift; the statement contradicts (A).

$∴$ Only (A) and (B) are correct.

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