Physical Chemistry-Chemical Kinetics (CSIR Chemical Sciences): Questions 1 - 4 of 41

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Question number: 1

» Physical Chemistry » Chemical Kinetics » Photochemical Reactions

Appeared in Year: 2014

MCQ▾

Question

Fluorescence lifetime of a molecule in a solution is 5×109s. Sum of all non-radioactive rate constant for decay of excited state is 1.2 ×108s1 . The fluorescence quantum yield of molecules is: - (June)

Choices

Choice (4) Response

a.

0.4

b.

0.2

c.

0.1

d.

0.6

Question number: 2

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

Appeared in Year: 2013

MCQ▾

Question

According to Arrhenius equation (k = rate constant) and T = temperature.

Choices

Choice (4) Response

a.

ln k increases linearly with T.

b.

lnkdecreaseslinearlywith1T.

c.

ln k increases linearly with 1T.

d.

ln k decreases linearly with T.

Question number: 3

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

Appeared in Year: 2013

MCQ▾

Question

Concentration of A undergoing reactions A→D is 1.0 (T = 0), 0.5 (T = 1), 0.33 (t = 2) and 0.25 (t = 3) seconds. Order of reaction is (June CSIR)

Choices

Choice (4) Response

a.

3

b.

1

c.

0

d.

2

Question number: 4

» Physical Chemistry » Chemical Kinetics » Steady State Approximation

Appeared in Year: 2014

MCQ▾

Question

Examine the following first order consecutive reaction. The rate constant (in S1 units) for each step is given above the arrow mark.

  1. P105Q108R
  2. P105Q103R
  3. P105Q103R
  4. P102Q106R

Steady-state approximation for backward reaction can be applied to:

Choices

Choice (4) Response

a.

3 only

b.

2 and 3 only

c.

1 only

d.

1 and 4 only

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