UV-Visible Spectroscopy Multiple Choice Questions and Answers | UV-Visible Spectroscopy MCQs

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Questions
1 The compound used to calibrate absorbance scale of the UV-visible instrument is
A HCl
B K2Cr2O7
C KCl
D KMnO4

Answer:K2Cr2O7
2 The units for absorbance are
A L mol -1 cm -1
B g mol -1 cm -1
C Mol. L -1.cm =1
D None of the above

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

Answer:1
4 The lmax in first derivative curve of UV spectra is denoted by slope value as
A 1
B 0
C -1
D Maximum

Answer:0
5 Dynodes are present in
A Barrier layer detector
B Phototube
C Photomultiplier tube
D Diode array

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

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

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

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

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

Answer:Below which a solvent absorbs too much radiation
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