Physical Chemistry-Chemical Kinetics (CSIR Chemical Sciences): Questions 23 - 26 of 41

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Question number: 23

» Physical Chemistry » Chemical Kinetics » Empirical Rate Laws and Temperature Dependence

Appeared in Year: 2012

MCQ▾

Question

A bacterial colony grows most commonly by call division. The change in population due to cell division in an actively growing colony is dN=λgNdt. The population of bacterial colony at time t [N0 = N (t = 0) ] (December)

Choices

Choice (4) Response

a.

N0exp(λgt)

b.

N0(λgt)2

c.

N0λgt

d.

N0exp[λgt]

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

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: 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

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