PPSC Chemistry Part I Physical Chemistry Online Test With Answers

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PPSC Chemistry Part I Physical Chemistry Online Test

Sr. # Questions Answers Choice
1 'A line, a point or a plane about which a symmetry operation is performed, is known as. Symmetry operation Symmetry element Reflection Inversion
2 The reverse of photo chemical reaction is called. Phosphorescence Chemiluminescence Fluorescence Photscnaitization
3 Reaction in which molecules absorbing light do not themselves react but induce other molecules to react are called. Chain reactions Photosenaitized reactions Reversible reactions Free radical reactions
4 Reaction in which molecules absorbing light do not themselves react but induce other moleculaes to react are called. Chain reactions Photosenaitized reactions Reversible reactions Free radical reactions
5 The Lambert beer law states that Transmission is directly proportional to path length Transmission is directly proportional to concentration Absorbance is inversely proportional to transmission Absorbance is directly proportional to concentration.
6 The extinction co efficient has the units. cm2 mol -1 cm3 mol-1 mol cm-3 mol cm-1
7 The value of an Einstein Is independent of wavelength Decrease with increase in wavelength Increase with increase in wavelength Depends on the temperature of the absorbing system
8 Which of the following statement is correct. The wavelength of phosphorescence is less than the wavelength absorbed Teh transition from T<sub>1</sub> to S<sub>0</sub> without the emission of light is called phosphorescence The combination CO2 and water in plants, in the presence of chlorophyll, is an example of bioluminescence. Population inversion is a necessary condition for laser action
9 According to the Grothus -Draper law Only absorbed light is effective in producing photo chemical changes Only light between certain wavelengths Light is effective only for photo chemical reactions is solution The light absorbed in proportional to its intensity
10 The quantum yield of a Photo chemical reaction in Always less than unity Always equal to unity Always greater than unity Can have any value &gt; 0 depending on the reaction
11 The molecule returns from the first excited triplet sate to the ground state singlet. The light emitted in known as. Inter system crossing Phosphorescence Fiuoreacence Quenching
12 Which of the following statement is not related with high quantum yield reasons. Formation of reactive intermediates which may act as catalyst The active molecules may collide with other molecules and activates these molecules. The reaction may be exothermic and heat evolve may activate other molecule The primary photo chemical process may be reversed
13 Which of the following statement is not true with respect to photo chemical reactions. These take place in the presence of light Free energy of these reactions may be positive or negative Light intensity affect these reactions Temperature has significant affect n rate of these reactions
14 Which of the following reactions does not take place with light radiation. Oxidation Reduction Polymerization Double displacement
15 A molecule returns from the excited singlet state to the ground singlet state with emission of light This process is known as Fluorescene Scattering Phosphorescence Chemiluminescence
16 A molecule returns from the excited singlet state to the ground singled state with emission of light , This process is known as. Fluorescene Scattering Phosphorescence Chemiluminescence
17 The mole of photon is known as Quantum Eienstein Energy Packet None of the above
18 The glow of the yellow phosphorous as a result of slow oxidation in air is called. Chemiluminescene Luminescence Biolumineacence Photolysis
19 The mole of photon is knonw as. Quantum Einstein Energy packet None of the above
20 The multiplicity of the electronic state is equal to. S + 1 2S + 1 2S - 2 2S + 2
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