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Q.

Which of the following substance acts as a catalyst for the following reaction?         2KClO3⟶2KCl+3O2

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a

MnO2

b

O2

c

HCl

d

All of these

answer is A.

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Detailed Solution

2KClO3→MnO22KCl+3O2 When little amount of MnO2 is added, the decomposition takes place at lower temperature and rate of reaction also increases. Amount of MnO2 remains unchanged during the reaction. Hence, MnO2 acts as a catalyst.
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