3H₂(g)}+ N₂(g)}⇔ 2NH₃(g)} ; H= -ve In the reaction above, lowering of temperature will

Correct Answer is : favour the forward reaction

have no effect on the equilibrium position

increase the rate of both the forward and reverse reactions equally

Correct Answer is : favour the forward reaction

Test Index

JAMB Chemistry 2018 Paper

Question : 76

Total: 87

_{2(g)}

_{2(g)}

_{3(g)}

In the reaction above, lowering of temperature will

Solution:

Concept:

The forward reaction is exothermic since

\Delta H

is negative.

Lowering the temperature shifts equilibrium to favour the exothermic reaction.

Explanation:

For the reaction:

3\mathrm{H}_{2(g)} + \mathrm{N}_{2(g)} \rightleftharpoons 2\mathrm{NH}_{3(g)}

\Delta H = -ve

Thus, the forward reaction releases heat, while the reverse reaction absorbs heat.

When temperature is lowered, the system loses heat energy.

According to Le Chatelier’s principle, the equilibrium shifts in the direction that produces heat to counteract the change.

Therefore, the forward reaction is favoured.

Answer:

C. favour the forward reaction.

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