ESR Spectroscopy MCQs for CSIR NET, GATE and IIT JAM - Inorganic Spectroscopy Assignment 3 - ChemContent

This article contains a quiz with 10 MCQ questions from Chemistry chapter "Inorganic Spectroscopy". Topic of assignment is ESR spectroscopy i.e. Electron Spin Resonance. These questions are helpful for practicing for CSIR NET, GATE and other chemistry related exams.

• Total Marks = 40
• Correct Answer = +4 Marks
• Incorrect Answer = -1 Marks

Inorganic Spectra Assignment 3 (ESR Spectroscopy)

Question 1.

Which of the following molecules are ESR active?

(1) H₂

(2) N₂

(3) O₂^2–

(4) B₂

1

2

3

4

Question 2.

What is the reason behind broad peaks in ESR spectrum than NMR?

(1) Large number of molecules are excited at once

(2) Relaxation time is small

(3) Relaxation time is large

(4) Small number of molecules are excited at once

1

2

3

4

Question 3.

What are the total number of hyperfine EPR lines present in CH₃ radical system?

(1) 5

(2) 8

(3) 4

(4) 1

1

2

3

4

Question 4.

What is the splitting pattern of ESR signal of H₂ radical?

(1) 1:1:1

(2) 1:3:1

(3) 1:2:1

(4) 2:1:2

1

2

3

4

Question 5.

How many hyperfine lines should be present in ESR spectra of CH₃CD₂ radical?

(1) 6

(2) 13

(3) 4

(4) 20

1

2

3

4

Question 6.

What are the total no. of hyperfine lines expected for?

(1) 0

(2) 9

(3) 5

(4) 2

1

2

3

4

Question 7.

What should be the frequency of free electron placed in magnetic field of strength 0.41 T with g = 2?

(1) 11.3 GHz

(2) 18.4 GHz

(3) 1.1 GHz

(4) 114.8 GHz

1

2

3

4

Question 8.

A benzene radical gives multiple lines with g value 4.31 in ESR instrument operating at frequency of 89 MHz. Calculate the magnetic field at which these lines are observed.

(1) 2 mT

(2) 1.48 mT

(3) 2 T

(4) 1.5 T

1

2

3

4

Question 9.

What is the unit of Bohr magneton normally used in calculations?

(1) Js

(2) JT^-1

(3) JS^-1

(4) JT

1

2

3

4

Question 10.

The energy difference (ΔE) for the two states characterized by +1/2 and –½ is equal to (symbols have their usual meaning):

(1)gβHo

(2) -½ gβHo

(3) +½ gβHo

(4) None of the above

1

2

3

4

Return to-

• Chemistry Chapterwise & Topicwise MCQs

Answer Key:

1. (4) 2. (2) 3. (3) 4. (3)  5. (4)  6. (3)  7. (1)  8. (2)  9. (2)  10. (1)

For further questions queries or suggestions, please leave your comments below.