When KClO(3) is heated, it decomposes in...

When `KClO_(3)` is heated, it decomposes into `KCl` and `O_(2)`. If some `MnO_(2)` is added, the reaction goes much faster because

`MnO_(2)` decomposes to give `O_(2)`.

`MnO_(2)` provides heat by reacting.

Better contact is provided by `MnO_(2)`.

`MnO_(2)` acts as a catatlyst.

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