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JEE Main levelOne or more correct optionsDifficulty 2 of 3ce132

$N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ is at equilibrium at constant temperature. Which of the following changes make $Q_{c} > K_{c}$ immediately after the change?

AAdding $NH X_{3}$ at constant volume
BRemoving some $H X_{2}$ at constant volume
CDoubling the volume of the container
DAdding $N X_{2}$ at constant volume

Answer: A, B, C

Q_{c} = [NH X_{3}]^{2} / ([N X_{2}] [H X_{2}]^{3})

. Adding

NH X_{3}

raises the numerator and removing

H X_{2}

lowers the denominator, so

Q_{c} > K_{c}

in both cases. Doubling the volume scales

Q_{c}

by

(1/2)^{2} / (1/2)^{4} = 4

, so again

Q_{c} > K_{c}

. Adding

N X_{2}

raises the denominator, so

Q_{c} < K_{c}

.

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