Catalyst is the substance in whose presence the rate of a chemical reaction changes, without causing any chemical change to it. The decomposition of hydrogen peroxide into water and oxygen normally takes place slowly at room temperature. However, when we add manganese dioxide (MnO2) Powder in it, the same reaction increases speed. No chemical change takes place in MnO2 in this reaction. Hence, manganese dioxide (MnO2) Powder is the catalyst here.
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