MHT CET 2024 Chemistry question
In a first order reaction if concentration of reactant drops from to in 15 minute. What is the time required to drop concentration from to
Answer: (C)
Solution
For a first-order reaction the half-life is independent of the initial concentration. Since 0.8 to 0.4 mol/L is a halving, min. The change 0.1 to 0.025 mol/L is a fall to one quarter, i.e. = two half-lives. So $t = 2 ×
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