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Potassium chlorate decomposes slowly on heating, but in the presence of manganese dioxide (MnO$_2$) it decomposes rapidly while MnO$_2$ itself undergoes no chemical change. MnO$_2$ here acts as a:
Aproduct
Boxidant
Ccatalyst
Dreactant
Answer & Solution
Correct answer: C. catalyst
1. MnO$_2$ increases the rate of decomposition of KClO$_3$.
2. Importantly, MnO$_2$ undergoes no chemical change in the reaction.
3. A substance that speeds up a reaction without being chemically changed is a catalyst.
4. It is not consumed as a reactant or formed as a product, and it does not supply oxygen for oxidation here, so those options are wrong.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 3 "Chemical Reactions and Equations", p.50_
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