North Maharashtra University 2009 B.Sc Chemistry Chemical Kinetics - Question Paper

species and over all order of the reaction.
6. define the method to determine the rate legal regulations of a reaction.
7. describe the rate of reaction.Derive 1st order integrated rate legal regulations for first
order reaction.
52
8. Derive an expression for the rate constant of a 1st order reaction.Give its
unit.
9. The reaction A ? product is 1st order reaction w.r.to A Derive an
expression for rate constant. provide the unit of rate constant.
10. Show that half life period of 1st order reaction is independent on initial
concentration of reactant.
11. define the kinetics investigation of the acid hydrolysis of methyl acetate
12. Derive the expression for velocity constant for thermal decomposition of
Azo isopropane.
13. Inversion of cane sugar is bimolecular reaction but follows the expression
of 1st order-prove it.
14. discuss the differential method to determine the order of a reaction.
15. explain the half life method for the determination of order of a reaction.
16. Acid hydrolysis of methyl acetate can be monitored by titrating the reaction
mixture with std. NaOH solution The subsequent data were produced
Time in min. 0 20 30 50 infinity
ml of alkali used 25 26.3 26.9 28.1 44.6
show that the reaction is of 1st order reactions.
17. Actinium decays 40 % in five hr. obtain the half life period of actinium element
?The subsequent data was found on hydrolysis of methyl acetate in
hydrochloric acid solution
Time (Sec.) 0 4500 7140 infinity
ml of alkali used 24.36 29.32 31.72 47.15
show that the reaction is 1st ordered.
18.The decomposition of H2O2 was learned by titrating it at various interval of
time with KMnO4;thefollowing data are found.
Time (Sec.) 0 600
7660
ml of alkali used 22.8 13.8 8.2
Show that the reaction is 1st ordered.
53
19.The time for half decomposition of N2O was 257 sec.when initial pressure
was 288mm and 210sec when initial pressure was 357mm.Find order of this
reaction.
20. For a chemical reaction A?D the rate of reaction is increased by factor 8
when the concentration of the reactant is doubled.What is the order of the
reaction.
21.Show that time needed for 75% of 1st order reaction is double that the
time needed for 50% reaction.
22.6.5 ml of solution of H2O2 was mixed with 15 ml water and 10 ml KI
solution. The quantity of oxygen evolved at various time intervals are provided in
table.
Time in min. three six nine 12 00
Ml of formed 12.5 24 33.8 41.5 88.0
Show that reaction is of 1st order.
23.The decomposition of acetaldehyde was learned in the gas phase at 791
K.The outcomes of 2 measurements are
Initial concn 9.72 X 10-3 4.56 X 10-3
Half life/s 328 572
What is the order of reaction.

ques. of 6 marks.
1. discuss the meaning of the terms rate constant ,order of reaction,
molecularity of reaction.
2. explain the factor affecting the rate of reaction.
3. describe rate of reaction.The reaction A ? products is 1st order w.r. to A
write its differential rate legal regulations and deduce integrated rate legal regulations from it .
4. Write down the formula for the velocity constant of a 1st order reaction
and discuss clearly the terms involved in it . Using the equation, obtain the
unit of the velocity constant. Show that for such a reaction half life has a
constant value.
54
5. What is pseudomolecular reaction? explain 1 cause for pseudo
behaviour.
6. explain the Kinetic investigation of thermal decomposition of
azoisopropane to hexane and nitrogen. Derive the expression for its rate
constant.
7. explain any 2 methods for determination of order of reaction.

Earning:   Approval pending.