Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 5

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Q: 8. In a pseudo first order hydrolysis of ester in water, the following results were obtained:

Q_8_Tabel of Pseudo First Order Hydrolysis of Ester in Water
Q_8_Tabel of Pseudo First Order Hydrolysis of Ester in Water

0

30

60

90

(i) Calculate the average rate of reaction between the time interval 30 to 60 seconds.

(ii) Calculate the pseudo first order rate constant for the hydrolysis of ester.

Answer:

(i) Average rate of reaction between the time interval, seconds,

(ii) For a pseudo first order reaction,

Then, average rate constant,

Q: 9. 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?

Answer:

(i) The differential rate equation will be

(ii) If the concentration of B is increased three times, then

Therefore, the rate of reaction will increase times.

(iii) When the concentrations of both A and B are doubled,

Therefore, the rate of reaction will increase times.