Define the term catalyst. Write one example where it is used.

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Solution

A catalyst is a substance that changes the rate of a chemical reaction without itself undergoing any chemical changes.
Example: In the following reaction, magnesium dioxide acts as a catalyst and itself does not undergo any chemical change.
$P o t a s s i u m c h l o r a t e + M a n g a n e s e d i o x i d e \to P o t a s s i u m c h l o r i d e + O x y g e n + M a n g a n e s e d i o x i d e$

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