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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 6
Total: 39
A reaction is second order with respect to a reactant. How is the rate of reaction affected if the concentration of the reactant is
(i) doubled
(ii) reduced to half ?
Solution:  
Rate =kR2
(i) If [A]=2R, rate =k(2R)2=4kR2 i.e. rate of reaction increases 4 timeswhen concentration is doubled.
(ii) If [A]=
1
2
R, rate =k (
R
2
 )2=
1
4
kR2‌‌ i.e. rate becomes
1
4
th whenconcentration is reduced to
1
2
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