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KVPY SX SB Exam 2012 Question Paper
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© examsnet.com
Question : 48
Total: 120
A zero-order reaction, A → Product, with an initial concentration
[
A
]
0
has a half-life of 0.2 s. If one starts with the concentration
2
[
A
]
0
, then the half-life is
0.1 s
0.4 s
0.2 s
0.8 s
Validate
Solution:
t
1
∕
2
∝
1
a
n
−
1
for zero order reaction n = 0
so
t
1
∕
2
∝
a
so
(
t
1
∕
2
)
1
(
t
1
∕
2
)
2
=
a
1
a
2
0.2
(
t
1
∕
2
)
2
=
[
A
0
]
2
[
A
]
0
t
1
∕
2
=
0.4
sec
© examsnet.com
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