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 At certain temperature, the half-life period in the thermal decomposition of a gaseous substance as follows:

P (mm Hg) 500 250
\mathrm{t _ {1/2}}  (in min.)   235 940

Find the order of reaction [Given: log (23.5) = 1.37; log (95) = 1.97]

 

 

Option: 1

0


Option: 2

1


Option: 3

2


Option: 4

3


Answers (1)

best_answer

\mathrm{\mathrm{t}_{1 / 2} \propto \frac{1}{a^{(n-1)}} ~\text { OR }~ \mathrm{t}_{1 / 2} \propto \frac{1}{P^{(n-1)}}}

On reducing pressure by 2 times, the half-time increased by 4 times. 

\mathrm{ \Rightarrow n-1=2 \\ }

\mathrm{ \Rightarrow n=3 }.

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