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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ce053

An equilibrium mixture of $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ is compressed isothermally to half its volume and allowed to re-equilibrate. Which statements are correct?

A $K_{c}$ becomes four times its original value
BImmediately after compression, $Q_{c} = K_{c} /4$
CAt the new equilibrium, the amount of $NH X_{3}$ is greater than before
DAt the new equilibrium, the amount of $H X_{2}$ is lower than before

Answer: B, C, D

K_{c}

depends only on temperature, so (A) is false. Doubling all concentrations gives

Q_{c} = 2^{2 - 4} K_{c} = K_{c} /4

, so (B) is true. Since

Q_{c} < K_{c}

, the reaction goes forward:

NH X_{3}

increases (C) and

H X_{2}

is consumed (D).

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