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Q.

For a first order reaction, rate constant is 6.93×10-2 min-1. t93.75% of the reaction is ------- minutes

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a

400

b

4000

c

4

d

40

answer is D.

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Detailed Solution

For a first order reaction,  t12=0.693K ; t12=0.6936.93×10-2 min-1 =10 minutes ; t93.75%=4t12=40 minutes ;
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For a first order reaction, rate constant is 6.93×10-2 min-1. t93.75% of the reaction is ------- minutes