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Free download in PDF UV-Visible Spectroscopy Multiple Choice Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams like UPSC, NDA, SSC etc. These short solved questions or quizzes are provided by Gkseries./p>
(1)
The compound used to calibrate absorbance scale of the UV-visible instrument is
[A]
HCl
[B]
K2Cr2O7
[C]
KCl
[D]
KMnO4
(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
(3)
At cut-off wavelength the absorbance of the solvent is
[A]
0
[B]
0.5
[C]
1
[D]
2
(4)
The lmax in first derivative curve of UV spectra is denoted by slope value as
[A]
1
[B]
0
[C]
-1
[D]
Maximum
(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
(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
(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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