When KClO₃ is heated, it decomposes into KCl + O₂. If some MnO₂ is added, the reaction goes much faster because
(a) MnO₂ decomposes to give O₂
(b) MnO₂ provides heat by reacting
(c) better contact is provided by MnO₂
(d) MnO₂ acts as a catalyst
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mno2 acts as a catalyst
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