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Chemistry · PYQ NEET UG 2020
हिन्दीThe rate constant for a first order reaction is \( 4.606 \times 10^{-3} \text{ s}^{-1} \). The time required to reduce \( 2.0 \text{ g} \) of the reactant to \( 0.2 \text{ g} \) is _______.
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Correct answer · Option B
500 s
Explanation
For a first-order reaction, \( t = \frac{2.303}{k} \log \frac{[A]_0}{[A]} = \frac{2.303}{4.606 \times 10^{-3}} \log \frac{2.0}{0.2} = \frac{2.303}{4.606 \times 10^{-3}} \times 1 = 500 \text{ s} \).
