MHT CET 2024 Chemistry question

What is rate constant of a first order reaction if 60% reactant decompose in 45 minute?

Answer: (C)

Solution

If 60% decomposes, 40% remains: , . For a first order reaction \dfrac{2.303}{t}$ = = × 0.3979 = 0.0204\ min^{-1}

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Question ID VK-092918