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Rationalised 2023-24
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Chemistry
A catalyst is a substance which increases the rate of a reaction without
itself undergoing any permanent chemical change For example, MnO2
catalyses the following reaction so as to increase its rate considerably 2KClO3 
MnO2
  2 KCl + 3O2
The word catalyst should not be used when the added substance
reduces the rate of raction The substance is then called inhibitor