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
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