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Q.

A first order reaction is found to have a rate constant, k=4.2×10−12s−1.Find the half-life of the reaction

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a

1.26×1013s

b

1.65×1011s

c

1.65×10−11s

d

1.26×10−13s

answer is B.

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Detailed Solution

For first order reaction,         t1/2=0.693k=0.6934.2×10−12s−1=1.65×1011s
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