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75 % of first order reaction is complete...

75 % of first order reaction is complete in 30 minutes. What is the time required for 93.75 % of the reaction (in minutes) ?

A

45

B

120

C

90

D

60

Text Solution

Verified by Experts

The correct Answer is:
D
`30=(2.303)/(k)"log" (100)/(25)`
`t=(2.303)/(k)"log"(100)/(6.25)`
`t=(2.303)/(k) log 16`
`=((2.303xxlog 4)/(k))xx2=30xx2`
= 60 min
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