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Which one of the following reactions is a true first order reaction?

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Decomposition of gaseous ammonia on a hot platinum surface

Alkaline hydrolysis of ethyl acetate

Decomposition of $N_{2} O$

reaction of NO with O₂

answer is C.

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Detailed Solution

$N_{2} O \to N_{2} + \frac{1}{2} O_{2}$

$\frac{d x}{d t} \propto {[N_{2} O]}^{1}$

i.e. order of reaction = 1

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