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Factors Affecting the Rate of a Chemical Reaction

KClO3 on heat...

Question

$K C l O_{3}$ on heating decomposes into $K C l$ and $O_{2}$ . If some $M n O_{2}$ is added, the reaction goes much faster because :

M n O_{2}

decomposes to give oxygen

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M n O_{2}

provides heat by reacting

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better contact is provided by

M n O_{2}

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M n O_{2}

acts as a catalyst

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Solution

The correct option is D $M n O_{2}$ acts as a catalyst
The reaction is as follows:
$2 K C l O_{3} h e a t - - \to 2 K C l + 3 O_{2}$
In this reaction, if $M n O_{2}$ is used, then the reaction become faster due to catalytic activities of $M n O_{2}$ .
(Catalyst is a substance which lowers activation energy of reaction because it provides alternate pathway for reaction. Also, it increases the rate of backward and forward reaction with same extent. Due to this lower activation energy, equilibrium is attained faster but it doesnot change the overall enthalpy of the reaction.)

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Similar questions

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

[CPMT 1971,76,80,94]

K C l O_{3}

K C l

O_{2}

M n O_{2}

2 K C l O_{3} + M n O_{2} + 2 K C l + 3 O_{2} (g) + M n O_{2}

O_{2}

K C l O_{3}

M n O_{2}

2 K C l O_{3} M n O_{2} - --- \to 2 K C l + 3 O_{2}

6.72 l i t r e s

x

10 x

K C l O_{3}

M n O_{2}

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