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80% of a first order reaction was comple...

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

B

140 min

C

100 min

D

200 min

Text Solution

Verified by Experts

The correct Answer is:
C
`t_(80%)=log(100)/(100-80)=log 10/2=log5=0.69 =0.7 t_(90%)=log(100)/(100-90)=log10=1`
`t_(90%) =70/7 =700/7 =100 minutes`
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