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Hess' Law

In the reacti...

Question

In the reaction, $2 K C l O_{3} + M n O_{2} + 2 K C l + 3 O_{2} (g) + M n O_{2}$ , which substance acts as catalyst?

O_{2}

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K C l O_{3}

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M n O_{2}

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KCl

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O_{2}

in the

M n O_{2}

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Solution

The correct option is D $M n O_{2}$
The catalyst used for the decomposition of potassium chlorate to oxygen is manganese dioxide $M n O_{2}$ .
In the reaction $2 K C l O_{3} + M n O_{2} \to 2 K C l + 3 O_{2} (g) + M n O_{2}$ , we see that $M n O_{2}$ is present on the reactant side as well as on the product side. Hence, it is a catalyst. We can rewrite the same reaction as: $2 K C l O_{3} M n O_{2} - --- \to 2 K C l + 3 O_{2} (g)$ .

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Similar questions

M n O_{2} + 2 K C l O_{3} ⟶ K_{2} M n O_{4} + C l_{2} + 2 O_{2}

C l_{2} + K M n O_{4} ⟶ 2 K C l + M n O_{2} + O_{2}

50 %

11.2

O_{2}

K C l O_{3}

M n O_{2} + 2 K C l O_{3} \to K_{2} M n O_{4} + C l_{2} + 2 O_{2}

C l_{2} + K_{2} M n O_{4} \to 2 K C l + M n O_{2} + O_{2}

O_{2}

K C l O_{3}

When is heated, it decomposes into . If some is added, the reaction goes much faster because

[CPMT 1971,76,80,94]

M n O_{2} + 2 K C l O_{3} ⟶ K_{2} M n O_{4} + C l_{2} + 2 O_{2}

C l_{2} + K M n O_{4} ⟶ 2 K C l + M n O_{2} + O_{2}

50 %

11.2

O_{2}

K C l O_{3}

K C l O_{3}

K C l

O_{2}

M n O_{2}

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