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Question

A first order reaction completes 50% in 69.3 minute. How much time it will take for 90% completion?

A
230.3 minutes
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B
115.15 minutes
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C
460.6 minutes
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D
None of these
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Solution

The correct option is A 230.3 minutes
For a first order reaction,
rate constant, k=0.693t1/2=0.69369.3=0.01 min1
k=2.303tlog10aax
where, a= initial amount of reactant
(ax)=amount of reactant remaining after time t
t=0.1a for 90% completion
0.01=2.303tlog10a0.1a
t=2.3030.01=230.3 min
Hence, (a) option is correct.

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