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Question

75% of a first order reaction was completed in 32 minutes. 50% of the reaction was complete in

A
4 min
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B
8 min
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C
16 min
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D
24 min
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Solution

The correct option is C 16 min
t34=2.303kloga14a=2.303klog4t34=2.303kloga12a=2.303klog2t34t12=log4log2=2t12=t342=322=16 min

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