For a first order reaction A → Products, initial concentration of A is 0.1 M, which becomes 0.001 M after 5 minutes. Rate constant for the reaction in min^-1 is

1. 0.2303

2. 1.3818

3. 0.9212

4. 0.4606

Doubtly Asked 30 Oct 2026 NEET UG 2022 Practice test neet Save WhatsApp Report

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Answer: 3. 0.9212

Key idea: for a first order reaction \(k=\dfrac{2.303}{t}\log\dfrac{[A]_0}{[A]}\).

\(k=\dfrac{2.303}{5}\log\dfrac{0.1}{0.001}=\dfrac{2.303}{5}\times2=0.9212\ \mathrm{min^{-1}}\).

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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