Consider the following reaction:
$2 S O_{2 (g)} + O_{2 (g)} ⇌ 2 S O_{3 (g)}$ Addition of a catalyst to this system would:

Upset the equilibrium permanently as the reactions would be occurring too quickly

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Increase the yield of prouduct.

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Increase the value of K.

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Allow the system to reach equilibrium more quickly.

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Solution

The correct option is D Allow the system to reach equilibrium more quickly.
A catalyst speed up the forward and backward reaction to the same extent. Hence, it does not upset the equilibrium permanently. As both the forward and backward reaction is increased to the same extent there is no particular increase in product and equilibrium constant. Equilibrium constant remains unchanged on addition of catalyst. But as the catalyst speeds up both forward and backward reaction the equilibrium is quickly attained. Hence, option D is the correct answer.

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