In a chemical reaction,a catalyst .......

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(D) catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. It works by provid

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decreases the activation energy

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(D) catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. It works by providing an alternative reaction pathway with a lower activation energy $(E_a)$. It does not change the equilibrium constant,the amount of products,or the enthalpy change $(\Delta H)$ of the reaction.

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