Physical Chemistry-Chemical Kinetics (CSIR (Council of Scientific & Industrial Research) Chemical Sciences): Questions 24 - 27 of 41

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Question number: 24

» Physical Chemistry » Chemical Kinetics » Determination of Reaction Mechanisms

Appeared in Year: 2013

MCQ▾

Question

First order gaseous reaction is 25 % complete in 30 min at 227 and in 10 minutes at 237. Activation energy of reaction is closest to (R = 2 cal k-1mol-1) (December)

Choices

Choice (4) Response

a.

110 k cal/mol

b.

55 k cal/mol

c.

5.5 k cal/mol

d.

27 k cal/mol

Question number: 25

» Physical Chemistry » Chemical Kinetics » Complex Reactions

Appeared in Year: 2013

MCQ▾

Question

In mechanism of this reaction first step is: (December)

Choices

Choice (4) Response

a.

Dissociation of H2 into H radical

b.

Reaction of Br radical with H2

c.

Dissociation of Br2 into Br radical

d.

Reaction of H radical with Br2

Question number: 26

» Physical Chemistry » Chemical Kinetics » Complex Reactions

Appeared in Year: 2013

MCQ▾

Question

In Lindeman mechanism of unimolecular reaction, observed order of low concentration is (June)

Choices

Choice (4) Response

a.

1

b.

2

c.

1.5

d.

0.5

Question number: 27

» Physical Chemistry » Chemical Kinetics » Steady State Approximation

Appeared in Year: 2013

MCQ▾

Question

[] D of a 90 % optically pure 2-aryl propanoic acid solution is + 135. On treatment with a base at RT for one hour, [] D change to. Optical purity is reduced to 40 % after 3hour. If so, the optical purity of solution after, 1 hour, and its [] D after 3 hour, respectively would be. (December)

Choices

Choice (4) Response

a.

20 % and 40%

b.

80 % and 90%

c.

80 % and 60%

d.

70 % and 60%

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