1.

KCIO_3 on heative decomposes into KCI and O_2. If some MnO_2 is added the reaction goes much faster because :

Answer»

`MnO_2` DECOMPOSES to give OXYGEN
`MnO_2` PROVIDES heat by reacting
Better contact is PROVIDED by `MnO_2`
`MnO_2` acts as a catalyst

Answer :D


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