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Byju's Answer
Standard VII
Chemistry
First Order Reaction
75 % of a fir...
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
t
3
4
=
2.303
k
l
o
g
a
1
4
a
=
2.303
k
l
o
g
4
t
3
4
=
2.303
k
l
o
g
a
1
2
a
=
2.303
k
l
o
g
2
∴
t
3
4
t
1
2
=
l
o
g
4
l
o
g
2
=
2
∴
t
1
2
=
t
3
4
2
=
32
2
=
16
m
i
n
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