B.Sc. Third year (UG degree course) Semester Fifth, Physical chemistry paper-XIII
Chapter – Photochemistry
1. A photochemical reaction takes place by the absorption of
a) visible and ultraviolet radiationsb) Infrared radiations
c) heat energy
d) none of these
2. Photochemistry deals with the study of
a) photons
b) photos
c) reactions which proceed with absorptions of visible and UV light
d) reactions which proceed with absorption of IR light
3. Photochemical activation is highly selective. This statement is…
a) true
b) false
c) sometimes true
d) none of these
4. The number of molecules reacted or formed per photon of light absorbed is called
a) yield of the reaction
b) quantum efficiency
c) quantum yield
d) quantum productivity
5. Spin multiplicity can be calculated by using equation
a) 2S-1
b) 2S+1
c) 2S
d) 2J+1
6. Spin multiplicity value for singlet state is
a) 1
b) 2
c) 0
d) 3
7. Spin multiplicity value for triplet state is
a) 1
b) 2
c) 0
d) 3
8. Non radiative process from the following is
a) Fluorescence
b) Phosphorescence
c) Internal conversion
d) Absorption
9. Radiative process from the following is
a) Fluorescence
b) Intersystem crossing
c) Internal conversion
d) All
10. Spin inversion of electrons take place in the following process
a) Fluorescence
b) Phosphorescence
c) Internal conversion
d) Absorption
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