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NCERT Class XII Chemistry
Chapter - Chemical Kinetics
Questions with Solutions

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Question : 9 of 39
Marks: +1, -0
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?
Solution:  
(i) Reaction is first order in A and second order in B, hence differentialrate equation is
dxdt=k[A][B]2\frac{dx}{dt}=k[A][B]^{2}
(ii) Let rate =kab2=k a b^{2}
        \;\;\;\;If [B][B] is tripled, Rate =ka(3b)2=9kab2=k a(3b)^{2}=9k a b^{2}
        \;\;\;\;i.e. Rate increases 9 times.
(iii) If both [A][A] and [B][B] are doubled, Rate =k(2a)(2b)2=k(2a)(2b)^{2}
=8kab2=8k a b^{2}
i.e. Rate of reaction increases 8 times.
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