Ageneral term for a chemical which accelerates a reaction without becoming chemically involved is called a
energizer
activator
accelerator
catalyst

D. Catalyst

Explanation:

A catalyst is a substance that speeds up a chemical reaction, but it is not consumed by the reaction. Hence a catalyst can be recovered chemically unchanged at the end of the reaction .

A catalyst lowers the activation energy and hence a large number of reactant particles collide and undergoes reaction. The particles have enough energy since the activation energy which is the minimum energy required for a reaction to occur becomes less.

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