Chemistry Class 12 NCERT Solutions: Chapter 4 ChemicalKinetic Part 7
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Q: 12. The reaction between A and B is first order with respect to and zero order with respect to B. Fill in the blanks in the following table:
Experiment 

 Initial rate 
I 



II   


III 

  
IV   


The given reaction is of the first order with respect to A and of zero order with respect to B.
Therefore, the rate of the reaction is given by,
⇒ Rate = k [A]
From experiment I, we obtain
From experiment II, we obtain
From experiment III, we obtain
From experiment IV, we obtain
Q: 13. Calculate the halflife of a first order reaction from their rate constants given below: (i)
(ii)
(iii)
Answer:
(i) Halflife,
(ii) Halflife,
(iii) Halflife,
Q: 14. The halflife for radioactive decay of is years. An archaeological artifact containing wood had only of the found in a living tree. Estimate the age of the sample.
Answer:
Here,
It is known that,
Hence, the age of the sample is years