`MnO_(2)` used as a catalyst in the preparation of oxygen from `KClO_(3)` should be completely free of carbon. Justify.

Explanation

`MnO_(2)` usually contains coal as impurity. If such `MnO_(2)` is used, carbon when heated with potassium chlorate leads to an explosion with the release of enormous amount of heat since it is a highly exothermic reaction.