Molecular Spectroscopy and Molecularity of a Reaction MCQs

By: Prof. Dr. Fazal Rehman | Last updated: November 27, 2024

1. An application of molecular spectroscopy is __________
(A). Structural investigation
(B). All of these
(C). Study of energetically excited reaction products
(D). Basis of understanding of colors
(E). None of these
Multiple Choice Question Answer: b

2. The results that are obtained by the spectroscopic methods are always less reliable, less reproducible and incorrect than the classical methods.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: a

3. Which of the following are The criteria for electronic spin resonance?
(A). Periodic change in polarizability
(B). Presence of unpaired electrons in a molecule
(C). Spin quantum number of nuclei > 0
(D). Presence of chromophore in a molecule
(E). None of these
Multiple Choice Question Answer: b

4. What is the Concentration of the reactants to the number of collisions and to the reaction rate?
(A). Directly proportional, inversely proportional
(B). Inversely proportional, inversely proportional
(C). Inversely proportional, directly proportional
(D). Directly proportional, directly proportional
(E). None of these
Multiple Choice Question Answer: d

5. The correct statement is that the Spectroscopic methods require _______
(A). Less time and less amount of sample than classical methods
(B). More time and more amount of sample than classical methods
(C). Less time and more amount of sample than classical methods
(D). More time and less amount of sample than classical methods
(E). None of these
Multiple Choice Question Answer: a

6. Transition zone for Raman spectra is among the _____
(A). Electronic levels
(B). Vibrational and rotational levels
(C). Magnetic levels of nuclei
(D). Magnetic levels of unpaired electrons
(E). None of these
Multiple Choice Question Answer: b

7. The reaction rate is greatly influenced by which of the following?
(A). Both nature and the strength of the reactant molecules
(B). The Strength of bond in reactant molecules
(C). The Nature of bonds in reactant molecules
(D). This never depends upon either the nature or the strength of the reactant molecules
(E). None of these
Multiple Choice Question Answer: a

8. The Molecularity of the multi-step reaction never makes any sense.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

9. The Sample recovery is always possible after the spectroscopic analysis due to the sample not being chemically affected.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

10. The elementary processes with molecularity are greater than which of the following that are not known?
(A). 3
(B). 2
(C). 1
(D). 0
(E). None of these
Multiple Choice Question Answer: a

11. Incorrect statement about the molecularity of a reaction is _______
(A). It is a theoretical concept
(B). Every step of a multi-step reaction always has the unique molecularity
(C). This can be zero, fractional or integer
(D). This is always equal to the total number of reactants that are taking part in the elementary step
(E). None of these
Multiple Choice Question Answer: c

12. The factor that does not affect the rate of reaction is ________
(A). Pressure
(B). Temperature
(C). Concentration of the reactant
(D). Effect of catalyst
(E). None of these
Multiple Choice Question Answer: a

13. The Molecularity of a reaction is equal to the total number of which of the following?
(A). Products formed in the elementary step
(B). Reactants and products in the elementary step
(C). Reactants taking part in elementary step
(D). Reactants and products in the final step
(E). None of these
Multiple Choice Question Answer: c

14. Reactions register an increase in the rates in presence of the radiations of the specific wavelengths.
(A). False
(B). True
(E). None of these
Multiple Choice Question Answer: b

15. During the motion, if the center of gravity of the molecule changes, then what does the molecule possess?
(A). Translational energy
(B). Rotational energy
(C). Electronic energy
(D). Vibrational energy
(E). None of these
Multiple Choice Question Answer: a

16. Which of the following are The different types of energies associated with a molecule?
(A). Electronic energy
(B). All of these
(C). Rotational energy
(D). Vibrational energy
(E). None of these
Multiple Choice Question Answer: b

17. Which of the following is The region of the electromagnetic spectrum for nuclear magnetic resonance?
(A). Radiofrequency
(B). Microwave
(C). Infrared
(D). UV-rays
(E). None of these
Multiple Choice Question Answer: a

18. Which of the following is The correct order of different types of energies?
(A). Eel >> Evib >> Etr >> Erot
(B). Eel >> Erot >> Evib >> Etr
(C). Eel >> Erot >> Evib >> Etr
(D). Eel >> Evib >> Erot >> Etr
(E). None of these
Multiple Choice Question Answer: d

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