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Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Pages: 3

Fifth Semester B.Tech Degree Regular and Supplementary Examination December 2020

Course Code: CH305
Course Name: CHEMICAL REACTION ENGINEERING-I

Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any two full questions, each carries 15 marks. Marks
1 a) Define reaction rate, rate constant, molecularity and order of a reaction. (4)
b) Derive the temperature dependency of rate constant using collision theory. (6)
c) The activation energy of a bimolecular reaction is about 10,000 cal/mol. How (5)
much faster this reaction takes place at 50 °C than at 30 °C?

2 9) Describe the types of mechanism involved and the intermediates formed in the (6)

progress of non-elementary reactions.
b) Differentiate between elementary and non-elementary reactions. (2)
c) For the gas phase decomposition of azomethane (7)
(CH3)2N> > (216 + No
The rate expression is
ty, = പ + where போ represents the concentration of azomethane.
` 1+(८ (+
Suggest a mechanism to explain this rate.

3 ஐ Derive the temperature dependency of rate constant using transition state theory. (7)
Compare Arrhenius theory and collision theory with transition state theory for
relating temperature and rate constant.

b) For the hydrogen bromide reaction (8)

11. + Bry > 2HBr
The experimental rate law is:
1

?| 67[ | ۳ء _

‎[HBr]‏ = مر
‎k, +k. [Br‏

‎, Suggest a reaction mechanism to explain this rate.