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JEE Main levelSingle correct optionDifficulty 2 of 3ce188

For $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ , $Δ H = - 92 kJ$ . The temperature of the equilibrium mixture in a rigid vessel is raised. Which statement is correct?

AThe amount of $NH X_{3}$ increases and $K_{c}$ increases
BThe amount of $NH X_{3}$ is unchanged because the volume is fixed
CThe amount of $NH X_{3}$ decreases and $K_{c}$ decreases
DThe amount of $NH X_{3}$ decreases but $K_{c}$ is unchanged

Answer: C

The forward reaction is exothermic, so heating favours the reverse direction and

NH X_{3}

decreases.

K_{c}

is a function of temperature, and for

Δ H < 0

it decreases as

T

rises.

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