First order gas phase | Chemical Kinetics | JEE MAIN 2026

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Question

First order gas phase reaction $$ \mathrm{A} \rightarrow \mathrm{~B}+\mathrm{C} $$ $p_i=$ initial pressure of gas $\mathrm{A}, p_t=$ total pressure of the reaction mixture at time $t$

Select the correct option:

A

$\frac{1}{t} \ln \frac{p_i}{2 p_i-p_t}$

B

$\frac{1}{t} \ln \frac{2 p_i}{p_i-p_t}$

C

$\frac{1}{t} \ln \frac{p_i}{3 p_i-2 p_t}$

D

$\frac{1}{t} \ln \frac{3 p_i}{4 p_i-p_t}$

✓ Correct! Well done.

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