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Byju's Answer
Standard XII
Chemistry
Order of Reaction
80
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,
t
80
%
∝
l
o
g
100
100
−
80
=
l
o
g
10
2
=
l
o
g
5
=
0.69
≈
0.7
t
80
%
∝
l
o
g
100
100
−
90
=
l
o
g
10
=
1
t
80
%
t
90
%
=
0.7
1
⇒
70
t
90
%
=
0.7
1
∴
t
90
%
=
70
0.7
=
700
7
=
100
m
i
n
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