What is a catalyst? How does it work?

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A catalyst is a chemical substance which can speed up the rate of a chemical reaction without being consumed itself. This happens due to the activation energy required for the reaction to take place getting reduced.

Catalysts can be substances which are in the same state as that of the reacts or they can have a different state. State here is used with reference to solid, liquid or gas. An example of catalysts which have the same state are...

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