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Q.

A reaction that is of the first order with respect to reactant A has a rate constant 6 min⁡−1. If we start with [A]=0.5 mol L−1, when would [A] reach the value 0.05 mol L−1

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a

0.384 min

b

0.15 min

c

3 min

d

3.84 min

answer is A.

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Detailed Solution

We know that for first order kinetics k=2.303tlog⁡aa−x(a−x)=0.05 mol L−1,  6=2.303tlog⁡0.50.05 t=2.3036log⁡0.50.05=2.3036=0.384min⁡
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