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NEET levelSingle correct optionDifficulty 1 of 3ck199

For a reversible reaction, a catalyst

Aspeeds up only the forward reaction
Bspeeds up the forward and reverse reactions equally and leaves $K$ unchanged
Cincreases the equilibrium constant $K$
Dspeeds up the forward reaction and slows the reverse reaction

Answer: B

A catalyst lowers the activation energy of both directions by the same amount, so both rates increase by the same factor and

K = k_{f} / k_{r}

is unchanged. Equilibrium is reached sooner, not shifted.

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