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WorksheetsPhotochemistry
Total questions: 15
Worksheet time: 11mins
This process promotes the molecule from the S0 to one of the vibration levels of the singlet excited states (S1, S2,..)
Absorption of photon
Emission of photon
Fluorescence
Vibrational relaxation
(a) fastest transition 10-15 s and it Starts from Ground level.
Stark Einsteins law is applicable to
Primary process
secondary process
chain termination process
thermal reactions
Quantum yield of a photo chemical reaction is always one.
Agree
Disagree
May be
Which of the following is a non-radiative transition
to a lower vibrational level within the same electronic state
Internal conversion
fluorescence
inter system crossing
vibrational relaxation
Which of the following is a non-radiative transition between two electronic states of the same spin multiplicity.
Internal conversion
Inter-system crossing
vibrational relaxation
Phosphorescence
Which of the following is a radiative transition between two electronic states of the same spin multiplicity and instantaneous process ?
Phosphorescence
fluorescence
chemiluminescence
photosensitization
which one of the following is a non-radiative transition between two iso-energetic vibrational levels belonging to electronic states of different spin multiplicity
Phosphorescence
Inter-system crossing
Fluorescence
internal conversion
____________ is a radiative transition between two electronic states of different spin multiplicity and occurs for a longer time even after the source is cut off.
Fluorescence
Phosphorescence
Bio-luminescence
Photo-sensitization
(a) is the number of molecules reacted divided by the number of photons absorbed by the system.
Photochemical Combination of H2 with Cl2 has a high quantum yield because of following reasons. Multiple answers may be selected .
Absorption of radiations in the first step involves production of atoms or free radicals, which initiate a series of chain reactions
The active molecules may collide with other molecules and activate them
Excited molecules may lose their energy by collisions with non-excited molecules
Molecules may not receive sufficient energy to enable them to react
What is the role of the uranyl ions added to oxalic acid solution in an chemical actinometer ?
chain initiation
photo sensitization
catalyst
reactant
select the substance which is not a photosensitizer?
Chlorine
mercury
Uranyl sulphate
chlorophyll
Silver bromide
Can you identify the enzyme which is oxidized during Emission of light by fireflies ?
Luciferin
Papain
Ficin
Trypsin
commercial analytical instruments used for Nitric oxide detection in air is based on reaction with ozone resulting in the formation of nitrogen dioxide in activated state . This technique is based on which of the following processes ?
Photosensitization
phosphorescence
chemiluminescence
Fluorescence
