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JEE Main levelOne or more correct optionsDifficulty 2 of 3ce196

The equilibrium $N X_{2} (g) + 3 H X_{2} (g) 2 NH X_{3} (g)$ ( $Δ H < 0$ ) in a closed rigid vessel is heated to a higher temperature and allowed to re-equilibrate. Select the correct statements.

A $K_{c}$ decreases
BBoth forward and reverse rate constants increase
CThe amount of $NH X_{3}$ increases
DThe equilibrium shifts in the backward direction

Answer: A, B, D

Heating a system with exothermic forward reaction decreases

K_{c}

and shifts it backward, so

NH X_{3}

decreases. Both

k_{f}

and

k_{r}

follow Arrhenius behaviour and increase with temperature (the reverse one more), which is why

K = k_{f} / k_{r}

falls.

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