A substance which alters the rate of reaction:

reactant

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product

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ingredient

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catalyst

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Solution

The correct option is D catalyst
Catalyst is a substance that changes (usually increases) the rate of a reaction, without being involved in the reaction.A catalyst provides large surface area to one of the reactants, providing it an exposure to be reacted upon by the other reactant.

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Similar questions

___are substances which alter the rates of chemical reactions without themselves undergoing any chemical change.

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