Which of the following catalyst is used in the preparation of oxygen by potassium chlorate?

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{M n O}_{2}

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N a O H

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{K M n O}_{4}

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Solution

The correct option is B ${M n O}_{2}$
The most convenient method for preparing oxygen in the laboratory involves the catalytic decomposition of solid potassium chlorate. Potassium chlorate decomposes at a low temperature if previously mixed with manganese dioxide $M n O_{2}$ which is a catalyst for the decomposition. Only the potassium chlorate is decomposed, and no perchlorate is formed:
$2 K C l O_{3} M n O_{2} \to 2 K C l + 3 O_{2}$

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