When $KClO_3$ is heated,it decomposes into $KCl + O_2$. If some $MnO_2$ is added,the reaction goes much faster because
- A$MnO_2$ decomposes to give $O_2$
- B$MnO_2$ provides heat by reacting
- CBetter contact is provided by $MnO_2$
- D$MnO_2$ acts as a catalyst
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