b)

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b)
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a)

b)

00000CH305121904

(203— 302) proceeds with a rate —193 = 1000]. Devise a two step mechanism

to explain this rate.
Propose a mechanism for the decomposition of Nitrous oxide (7/0 — ‏ول(‎ +> 02) (5)

and show that the rate is given by:

10 [१2०]?
ர =
120 1+k’[N20]
Variation of the rate constant with temperature for the reaction (8)

21005 - 2700, + 0,

is given in the following table.

Temp. (K) 2 318

Determine graphically, the activation energy for the reaction and frequency factor.
PART B
Answer any two full questions, each carries 15 marks.
For the figure below, write a suitable rate expression. (3)

ना ‏ایر‎
‎Slope = 5

ಗ್ಯ
ಹ
(-rayiCa

Derive the kinetics of Autcatalytic reactions. (5)

For the liquid phase reaction, A - P, in a series of experiments in a batch reactor, (7)
the half-life (உ was found 10 be inversely proportional to the square root of the initial
concentration of A. Determine the order of the reaction.
Define Damkohler number. Give its physical significance. Write down Damkohler (2)
number for first and second order reactions.
An isothermal aqueous phase reversible reaction, ൧൦൨൪ is to be carried out ina (7)
mixed flow reactor. the reaction rate in kmol/(m*.h) is given by:

0.12560 — 0.56 = ي-
‎A stream containing only A enters the reactor. Determine the residence time required‏

(in hours) for 40% conversion of A.

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