Question:
Which of the following catalyst is used in the decomposition of $\mathrm{KClO_3}$?
Which of the following catalyst is used in the decomposition of $\mathrm{KClO_3}$?
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Chemistry Tip: $\mathrm{MnO_2}$ is common catalyst for laboratory preparation of oxygen.
Updated On: Apr 23, 2026
- Platinized asbestos
- Fe-Cr catalyst
- Ni
- $\mathrm{MnO_2}$
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The Correct Option is D
Solution and Explanation
Step 1: Potassium chlorate decomposes on heating:
$$
2KClO_3 \rightarrow 2KCl+3O_2
$$
Step 2: This reaction is slow without catalyst.
Step 3: $\mathrm{MnO_2}$ is commonly used catalyst.
Step 4: It increases rate of oxygen evolution. $$ \therefore \text{Correct option is (D).} $$
Step 2: This reaction is slow without catalyst.
Step 3: $\mathrm{MnO_2}$ is commonly used catalyst.
Step 4: It increases rate of oxygen evolution. $$ \therefore \text{Correct option is (D).} $$
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