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Questions  

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

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a
400
b
4000
c
4
d
40

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detailed solution

Correct option is D

For a first order reaction,  t12=0.693K ; t12=0.6936.93×10-2 min-1 =10 minutes ; t93.75%=4t12=40 minutes ;
ctaimg

ctaimg

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In a first order reaction, reactant concentration 'C' varies with time 't' as

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