Q.

Consider the following reaction for which the change in enthalpy is positive.2 A( g)+B(g)⇌C(g)+D(g)Which of the following will not affect the equilibrium?

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Change in concentration of reactants

Change in pressure

Change in temperature

Presence of catalyst

answer is D.

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Detailed Solution

2Ag + Bg ⇄ Cg + Dg ;∆H = +veΔn = 2−3 = –1∴ Increase in pressure favours forward reaction∵ the reaction is endothermic, forward reaction is favoured at high temperature.Addition of A (or) B and removal of C (or) D favours forward reactionCatalyst has no influence on equilibrium state. It increases both rate of forward reaction and rate of backward reaction to the same extent.

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