Manganese dioxide is used in the decomposition of potassium chlorate to evolve oxygen.In this reaction manganese dioxide act as a
a)Promoter b)Catalyst c)Product
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Answer:
When potassium chlorate (KClO3) is heated in the presence of manganese dioxide catalyst, it decomposes to form potassium chloride and oxygen gas.
The balanced chemical equation is
2KClO3→Δ2KCl+3O2
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The correct answer is Option b: Catalyst
- Manganese dioxide acts as a catalyst by lowering the activation energy of reactants in the formation of the product.
- It will shorten the reaction time and speed up the synthesis of potassium chloride when compared to a reaction that does not use a catalyst.
- The process will still need to be heated, but it will do so at a reduced temperature than before due to the influence of manganese dioxide.
- The reaction can be shown as:
2KClO₃ → Δ + MnO₂(catalyst) → 2KCl + 3O₂ (Rate of reaction increases)
- Hence, Manganese dioxide acts as a catalyst in the chemical reaction.
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