Q.

A catalyst speeds up a chemical reaction by :

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a

providing an alternate reaction pathway.

b

increasing the activation energy.

c

shifting the equilibrium.

d

decreasing the reaction enthalpy

answer is D.

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Detailed Solution

By offering a different reaction mechanism with a lower activation energy while being unaffected by the reaction, a catalyst accelerates a chemical reaction. Along with the rate constant, it has no effect on the heat received or released during the reaction.

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