Q36 · CSIR-NET Chemistry, June 2021

Paper: CSIR-NET June 2021 · Subject: Physical Chemistry · Chapter: Chemical Kinetics · Topic: Chemical Kinetics – General · Marks: 2 · Difficulty: Hard

The rate of decomposition of a gas is $10 \mathrm{mM} \mathrm{s}^{-1}$ when $10 \%$ is reacted and it is $5 \mathrm{mM} \mathrm{s}^{-1}$ when $40 \%$ is reacted. The order of the reaction is:
(a)2
(b)1.71
(c)0
(d)2.15
Answer
Answer: B ✓ checked by 4AB · confidence high

The source book printed no answer; this one was worked out and checked — see the explanation.

Explanation
Rate ∝ (fraction remaining)ⁿ: 10/5 = (0.9/0.6)ⁿ ⇒ n = ln 2/ln 1.5 = 1.71.

Study loop for Chemical Kinetics

1. Practise the PYQsPrevious-year questions, with answers

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