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Question

80% of a first order reaction was completed in 70 min. How much it will take for 90% completion of a reaction ?

A
114 min
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B
100 min
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C
140 min
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D
70 min
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Solution

The correct option is A 100 min
According to given conditions,
t80%log10010080=log102
=log 5=0.69 0.7
t80%log10010090=log10=1
t80%t90%=0.7170t90%=0.71
t90%=700.7=7007=100min

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