UV-Visible Spectroscopy Solved Problems | UV-Visible Spectroscopy MCQs

Questions

1 Molar extinction coefficient has units of

A lit.mol^-1.cm^-1

B dl.g ^-1cm ^-1

C No units

D lit.g ^-1cm ^-1

View Answer

Answer:lit.mol^-1.cm^-1

2 Which of the following statement is not correct ?

A Absorptivity changes with the intensity of the light

B Absorbance is independent of intensity of the light

C Absorbance has no units

D Absorptivity is a constant and depends on the nature of the molecule

View Answer

Answer:Absorptivity changes with the intensity of the light

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3 The above listed compounds are transparent in

A Vacuum UV region

B UV-visible region

C Visible only

D UV only

View Answer

Answer:UV-visible region

4 Which of the following is a non-dispersive wavelength selector

A Gratings

B Prisms

C filters

D All the above

View Answer

Answer:filters

5 All of the following are useful as a source for UV-Visible, EXCEPT

A Globar source

B Xenon discharge lamp

C Deuterium discharge lamp

D Tungsten filament lamp

View Answer

Answer:Globar source

6 Which of the following material is used to coat the cathode in photo tube

A Copper

B Sodium

C Bromium

D Cesium

View Answer

Answer:Cesium

7 Iodine is filled in the tungsten filament lamps to

A Increase the emission wavelength spectra

B Re-deposit the sublimed tungsten

C Decrease the decomposition of the tungsten

D All of the above

View Answer

Answer:Re-deposit the sublimed tungsten

8 Collimator is a device used in monochromators to

A Focus the required range of wavelength of radiation

B Eliminate interferences from other amines

C Eliminate reflection and scattering

D Focus the incident radiation parallel on to the dispersing device

View Answer

Answer:Focus the incident radiation parallel on to the dispersing device

9 Which of the following leads to chemical deviation from Beer’s law

A Change in refractive index

B Change in pH of the solution

C Polychromatic radiation

D Both a and b

View Answer

Answer:Change in pH of the solution

10 All of the following expressions are correct, except

A T=I _t/I ₀

B A=-logT

C A=2 - log%T

D A=-log(I₀ /I_t)

View Answer

Answer:A=-log(I₀ /I_t)

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