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Class 12 NEET Chemistry Chemical Kinetics Questions
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© examsnet.com
Question : 26
Total: 73
A first order reaction has a specific reaction rate of
10
–
2
s
e
c
–
1
. How much time will it take for 20g of the reactant to reduce to 5 g ?
[NEET 2017]
138.6 sec
346.5 sec
693.0 sec
238.6 sec
Validate
Solution:
👈: Video Solution
Half life of first order reaction
t
1
2
=
0.693
K
=
0.693
10
−
2
=
69.3
sec
Method-1
Total time
=
2
t
1
2
=
2
×
69.3
=
138.6
s
e
c
Method-2
t
=
2.303
K
log
[
A
]
0
[
A
]
1
t
=
2.303
10
−
2
log
20
5
⇒
t
=
138.6
s
e
c
© examsnet.com
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