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UV-Visible Spectroscopy Interview Questions and Answers | UV-Visible Spectroscopy MCQs

Questions
1 Solvatochromism is the ability of a substance to change colour due to
A A change in wavelength of the incident radiation
B A change in the solvent viscosity
C A change in molecular weight of the substance
D A change in the solvent polarity

Answer:A change in the solvent polarity
2 Two compounds A and B have molar absorptivity as 1200 and 15,000 mol lit -1cm -1 respectively. Which of the following statements is correct regarding them?
A Compound A can be detected at very low concentrations than compound B.
B Compound B can be detected at very low concentrations than compound A.
C Both compounds can be detected at very dilute concentrations.
D Molar absorptivity have no influence on the detection of compounds.

Answer:Compound B can be detected at very low concentrations than compound A.
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3 Which of the following shows bathochromic shift in polar solvent
A Water
B Ethanol
C Ethylene
D Chloroform

Answer:Ethylene
4 The colour of a substance perceived by human eye is
A Same as that the substance emits in flame
B Same as that the substance absorbs
C Not same as that the substance absorbs
D Not same as that the substance emits

Answer:Not same as that the substance absorbs
5 The color of potassium permanganate solution is due to
A n→π *
B π→π *
C d →d*
D n→s*

Answer:d →d*
6 Which of the following detector has fast response time
A Photomultiplier tube
B Photo tube
C photo diode array
D Barrier layer cell

Answer:photo diode array
7 The light which reaches the detector without passing through the cell is known as
A Dark radiation
B Stray radiation
C Photoluminescence
D Chemiluminescence

Answer:Stray radiation
8 A sample exhibited has an absorbance 1.0 in UV-Visble spectroscopy. the percentage transmittance will be
A 1%n
B 0.1%
C 10%
D 0.01%

Answer:10%
9 In phototube, photo multiplier tube, the transmitted light from the cells produces photocurrent by falling on
A Photocathode
B Photoanode
C Metal junction
D Metal layer

Answer:Photocathode
10 The absorptivity of a standard sample of 1% w/v solution measured at a path length of 1 cm, A(1%, 1 cm), is 312 at 254 nm. The absorbance of the test sample was observed 0.624 at 254 nm. The concentration of test sample is
A 5 g/100ml
B 5 mg/100 ml
C 2 g/100ml
D 2mg/100 ml

Answer:2mg/100 ml

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