Engineering Chemistry Questions and Answers – Electronic Spectroscopy

This set of Engineering Chemistry Multiple Choice Questions & Answers (MCQs) focuses on “Electronic Spectroscopy”.

1. The electronic spectra in the visible range span is __________
a) 25000-72000 cm^-1
b) 25000-50000 cm^-1
c) 12500-25000 cm^-1
d) 15000-30000 cm^-1
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2. Which of the following transitions are of weak intensities and lie in the visible region?
a) n→n^*
b) σ→σ^*
c) π→π^*
d) n→σ^*
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3. Arrange the various electronic transitions in the order of increasing energy.
a) n→σ^* < π→π^* < n→π^* < σ→σ^*
b) n→π^* < π→π^* < n→σ^* < σ→σ^*
c) n→σ^* < n→π^* < π→π^* < σ→σ^*
d) σ→σ^* < π→π^* < n→π^* < n→σ^*
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4. What is the position of the band of alkanes?
a) 190 nm
b) 185 nm
c) 217 nm
d) 150 nm
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5. Which of the following organic compound shows transition due to conjugation?
a) Alkenes
b) Saturated aliphatic ketones
c) Conjugated dienes
d) Alkanes
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6. Which of the following is not an auxochrome group?
a) –OH
b) –SH
c) –OR
d) –O₂
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7. Which of the following shift leads to the decreased intensity of absorption?
a) Hypochromic
b) Hyperchromic
c) Hypsochromic
d) Bathochromic
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8. Which of the following is an application of electronic spectroscopy?
a) Detection of impurities
b) Control of purification
c) Study of kinetics of the chemical reaction
d) All of the mentioned
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9. What will be the absorbance if %T = 80?
a) 0.5
b) 0.05
c) 0.097
d) 0.97
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10. Which of the following is a limitation of the Lambert-Beer’s law?
a) Scattering of light due to particles
b) Fluorescence of sample
c) Non-monochromatic radiation
d) All of the mentioned
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Sanfoundry Global Education & Learning Series – Engineering Chemistry.

To practice all areas of Engineering Chemistry, here is complete set of 1000+ Multiple Choice Questions and Answers.