CSIR Chemical Sciences: Questions 29 - 32 of 427

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Question number: 29

» Physical Chemistry » Chemical Kinetics » Complex Reactions

Appeared in Year: 2013

MCQ▾

Question

H2+Br22HBr, 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: 30

» 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: 31

» Physical Chemistry » Chemical Kinetics » Steady State Approximation

Appeared in Year: 2013

MCQ▾

Question

[ α ] D of a 90 % optically pure 2-aryl propanoic acid solution is + 135 ° . On treatment with a base at RT for one hour, [ α ] D change to +120 . Optical purity is reduced to 40 % after 3hour. If so, the optical purity of solution after, 1 hour, and its [ α ] 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%

Question number: 32

» Physical Chemistry » Chemical Kinetics » Photochemical Reactions

Appeared in Year: 2015

MCQ▾

Question

First order rate constant for a animolecular gas phase reaction A products, that follows Lindemann mechanism is 2.0 S1 of PA = 1 atm and 4.0 S1 of PA = 2 atm. The rate constant for activation step is: - (December)

Choices

Choice (4) Response

a.

1.0atm2s1

b.

2.0atm1s1

c.

8.0 atm1s1

d.

4.0atm1s1

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