Photochemistry MCQ

Photochemistry MCQ

Photochemistry MCQ, Multiple Choice Questions on Photochemistry, Photochemistry Multiple Choice Questions and Answers, MCQ on photochemical reactions, photochemistry quiz, Engineering Chemistry MCQ, Engineering MCQ

Electrochemistry MCQ

Objective Type Questions

Q.1. _____________ is concerned with chemical effects of light.

  • Photochemistry
  • Photolysis
  • Both
  • None of these

Answer: Photochemistry

Q.2. The law that explains the thickness of absorbing light and an optical path of light is

  • Bear-Lamberts law
  • Grotthuss–Draper law
  • Stark-Einstein law
  • None of these

Answer: Bear-Lamberts law

Q.3. Electronically excited molecules that return to the ground state with the same multiplicity are called

  • Phosphorescence
  • Fluorescence
  • Photosensitisation
  • Luminescence

Answer: Fluorescence

Q.4. Second-sphere co-ordination compounds belong to

  • Intra molecular photochemistry
  • Inter molecular photochemistry
  • Supramolecular photochemistry
  • Super molecular photochemistry

Answer: Supramolecular photochemistry

Q.5. The light formed from a chemical reaction is called

  • Luminescence
  • Bioluminescence
  • Chemiluminescence
  • All the above

Answer: Chemiluminescence

Q.6. Fireflies are an example of

  • Bioluminescence
  • Photolysis
  • Photosynthesis
  • Photoisomerisation

Answer: Bioluminescence

Q.7. The chemical effects produced by light radiations chiefly in the visible and ultraviolet region is

  • Thermochemistry
  • Electrochemistry
  • Photochemistry
  • Nanochemistry

Answer: Photochemistry

Q.8. Photochemical reactions occur spontaneously with

  • Decrease in free energy
  • Increase in free energy
  • Both increase and decrease in free energy
  • Neither increase nor decrease in free energy

Answer: Both increase and decrease in free energy

Q.9. When light is incident on any substance, only that portion of the incident light which is absorbed is effective in bringing about photochemical reactions. The reflected and transmitted light play no role in the reaction. This was stated by

  • Grotthuss and Draper
  • Stark and Einstein
  • Beer and Lambert
  • Kohlrausch

Answer: Grotthuss and Draper

Q.10. The ratio of the number of molecules reacting in a given time and the number of photons absorbed in the same time is termed as

  • Quantum yield
  • Quantum efficiency
  • Both the above 
  • Quantum number

Answer: Both the above

Q.11. The range of radiations usually used for the photochemical reactions is

  • 2000–4000 Å
  • 2000–8000 Å
  • 6000–8000 Å
  • 4000–6000 Å

Answer: 2000–8000 Å

Q.12. The energy contained in one einstein is

  • E = hυ
  • Nhc/λ
  • Nhυ/c
  • Nhc/υ

Answer: Nhc/λ

Q.13. The quantum yield for the reaction H2+ Cl2 → 2HCl is

  • 1
  • Less than one
  • 3
  • 104 to 106

Answer: 104 to 106

Q.14. When an electron in the excited singlet state returns to the ground state by emitting radiation, the phenomenon is called

  • Chemiluminiscence
  • Fluorescence
  • Phosphorescence
  • Bioluminescence

Answer: Fluorescence

Q.15. The excitation of a molecule without spin inversion gives rise to the

  • Singlet excited state
  • Triplet excited state
  • Both the above  
  • None of the above

Answer: Singlet excited state

Q.16. The phenomenon in which a molecule absorbs light radiations and activates another molecule which is itself incapable of absorbing light energy by the transfer of energy is called

  • Fluorescence
  • Phosphorescence
  • Photosensitisation
  • Photoexcitation

Answer: Photosensitisation

Q.17. The common applications of semiconductors in photochemistry are

  • Photovoltaic cells
  • Photocatalysts
  • Sensitisers for water splitting
  • All of the above

Answer: All of the above

Q.18. Host–guest chemistry is another term for

  • Supramolecular chemistry
  • Supermolecular chemistry
  • Semiconductor chemistry
  • Optical sensor technology

Answer: Supramolecular chemistry

Q.19. Interactions not found in supramolecules are

  • Dipole–dipole interaction
  • Covalent bond interaction
  • π – π stacking
  • van der Waals forces

Answer: Covalent bond interaction

Q.20. Which of the following molecule will not self assemble to form a supramolecule?

  • Micelles
  • Zeolite
  • Cyclodextrins
  • Water

Answer: Water

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