# Chemistry Class 12 NCERT Solutions: Chapter 4 Chemical-Kinetic Part 6

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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,