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Question

A __ is a substance which changes the rate of a chemical reaction without itself undergoing any chemical change.


Solution

A catalyst is a substance which changes the rate of a chemical reaction without itself undergoing any chemical change.Some reactions need a catalyst to speed up or slow down the reaction.

For example: Manganese dioxide acts as a catalyst for the decomposition of potassium chlorate into potassium chloride and oxygen at a lower temperature.Manganese dioxide does not undergo any change in its chemical composition.


Chemistry

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