# Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 6 (For CBSE, ICSE, IAS, NET, NRA 2022)

Doorsteptutor material for CBSE/Class-12 is prepared by world's top subject experts: get questions, notes, tests, video lectures and more- for all subjects of CBSE/Class-12.

Q: 10. In a reaction between A and B, the initial rate of reaction was measured for different initial concentrations of A and B as given below:

0.20 | 0.20 | 0.40 | |

0.30 | 0.10 | 0.05 | |

What is the order of the reaction with respect to A and B?

Answer:

Let the order of the reaction with respect to A be x and with respect to B be y.

Therefore,

Dividing equation (i) by (ii) , we obtain

Dividing equation (iii) by (ii) , we obtain

Hence, the order of the reaction with respect to A is and with respect to B is zero

Q: 11. The following results have been obtained during the kinetic studies of the reaction:

Experiment | Initial rate of formation of | ||

I | |||

II | |||

III | |||

IV |

Determine the rate law and the rate constant for the reaction.

Answer:

Let the order of the reaction with respect to A be x and with respect to B be y.

Therefore, rate of the reaction is given by,

According to the question,

Dividing equation (iv) by (i) , we obtain

Dividing equation (iii) by (ii) , we obtain

Therefore, the rate law is

From experiment I, we obtain

From experiment II, we obtain

From experiment III, we obtain

From experiment IV, we obtain

Therefore, rate constant,