NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions
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Question : 9
Total: 39
A reaction is first order in A and second order in B.
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentration of B three times?
(iii) How is the rate affected when the concentrations of both A and B are doubled?
(i) Write the differential rate equation.
(ii) How is the rate affected on increasing the concentration of B three times?
(iii) How is the rate affected when the concentrations of both A and B are doubled?
Solution:
(i) Reaction is first order in A and second order in B, hence differentialrate equation is
= k [ A ] [ B ] 2
(ii) Let rate= k a b 2
If [ B ] is tripled, Rate = k a ( 3 b ) 2 = 9 k a b 2
i.e. Rate increases 9 times.
(iii) If both[ A ] and [ B ] are doubled, Rate = k ( 2 a ) ( 2 b ) 2
= 8 k a b 2
i.e. Rate of reaction increases 8 times.
(ii) Let rate
(iii) If both
i.e. Rate of reaction increases 8 times.
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