Photochemistry MCQ- B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII (Part 3)

 B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII

Chapter – Photochemistry

Multiple choice Questions

1. The substances which initiate a photochemical reaction but itself does not undergo any chemical change is called
a)  catalysis
b) fluorescent
c) sensitizer
d) none of these

2. Fluorescence occurs when transition is
a)  Triplet-Triplet
b) Singlet-singlet
c)  Triplet-singlet
d) All of these

3. What will be the quantum yield when one mole of substance reacts by absorbing 6.022x 10²³ Photons
a)  0.1
b) 1
c)  10
d) Zero

4.If one molecule decomposes per photon the quantum yield is
a)  3
b) 2
c) 1
d) Zero

5.Photochemical decomposition of a substance is called
a) Photolysis
b) Chemolysis
c)  Both
d) None of these

6. The energy, E, of an Avogadro number (N) of photons is referred to as one Einstein having equation
a) E=Nhc/λ
b) Nhc
c)  Nλ/c
d) hc

7. In photosynthesis reaction which of the following act as Photosensitizer
a)  H₂O
b) CO₂
c) Chlorophyll
d) Light

8.Which of the following is radiative transition
a)  Fluorescence
b) Phosphorescence
c) Both a and b
d) None of these

9.Photochemical reactions are occurred by absorbing
a)  Heat
b) Light
c)  Both a and b
d) None of these

10.In the photochemical reaction between H2 and O2 Photosensitizer used as…..
a) Hg vapours
b) Water vapours
c)  SO₃ vapours

d) All of these

More questions 

Part1 Click here 

Part2 Click here 

Part 3 Click here

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