Questions Based on UV Visible Spectroscopy | UV-Visible Spectroscopy MCQs

Questions

1 The compound used to calibrate absorbance scale of the UV-visible instrument is

A HCl

B K₂Cr₂O₇

C KCl

D KMnO₄

View Answer

Answer:K₂Cr₂O₇

2 The units for absorbance are

A L mol ^-1cm ^-1

B g mol ^-1cm ^-1

C Mol. L ^-1.cm ⁼¹

D None of the above

View Answer

Answer:None of the above

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3 At cut-off wavelength the absorbance of the solvent is

A 0

B 0.5

C 1

D 2

View Answer

Answer:1

4 The l_max in first derivative curve of UV spectra is denoted by slope value as

A 1

B 0

C -1

D Maximum

View Answer

Answer:0

5 Dynodes are present in

A Barrier layer detector

B Phototube

C Photomultiplier tube

D Diode array

View Answer

Answer:Photomultiplier tube

6 Positive deviation from Beer’s law is due to

A Absorption of stray radiation

B Non absorption of stray radiation

C It does not depend on stray radiation

D None of the above

View Answer

Answer:Absorption of stray radiation

7 All of the following change the absorptivity of a sample EXCEPT

A Concentration

B Molecular structure

C Wavelength of radiation

D Temperature

View Answer

Answer:Concentration

8 A sample contains a polyprotic acid absorbs at different wavelengths. The sample can be analyzed at the wavelength of

A Max wavelength

B Max absorptivity

C Isosbestic point

D Highest pH

View Answer

Answer:Isosbestic point

9 Absorption spectra is a plot of

A Absorbance Vs Concentration

B Absorbance Vs wavelength

C % T Vs Wavelength

D % T Vs Concentration

View Answer

Answer:Absorbance Vs wavelength

10 Cut off wave length is the wavelength

A Below which a solvent absorbs too much radiation

B Above which a solvent absorbs too much radiation

C Below which an analyte absorbs too much radiation

D Above which a analyte absorbs too much radiation

View Answer

Answer:Below which a solvent absorbs too much radiation

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