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Question

A first order reaction is 60% complete in 20 minutes. How long will the reaction take to be 84% complete?

A
76 mins
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B
54 mins
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C
68 mins
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D
40 mins
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Solution

The correct option is D 40 mins
If a reaction is 60% complete, 40% remains and if it is 84% complete, 16% remains.

For a first order reaction:
k=2.30320log10040=2.303tlog10016

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