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Test: Color & Electronic Spectra - Chemistry MCQ


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15 Questions MCQ Test - Test: Color & Electronic Spectra

Test: Color & Electronic Spectra for Chemistry 2024 is part of Chemistry preparation. The Test: Color & Electronic Spectra questions and answers have been prepared according to the Chemistry exam syllabus.The Test: Color & Electronic Spectra MCQs are made for Chemistry 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Color & Electronic Spectra below.
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Test: Color & Electronic Spectra - Question 1

The red color of oxyhaemoglobin is mainly due to the

Test: Color & Electronic Spectra - Question 2

[CoCl4]2- shows a deep blue color because of

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Test: Color & Electronic Spectra - Question 3

The molar absorptivity at λmax is minimum for

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Test: Color & Electronic Spectra - Question 4

The bright yellow color of [Cu(phen)2]+ (phen=1, 10-phenanthroline) is due to

Test: Color & Electronic Spectra - Question 5

The compound that absorbs the light of the longest wavelength is

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Test: Color & Electronic Spectra - Question 6

The absorption of [Co(NH3)6]2+ is:

Test: Color & Electronic Spectra - Question 7

The complex which exhibits lowest energy electronic absorption band is:

Test: Color & Electronic Spectra - Question 8

Which one of the following complex ions shows minimum intensity of absorption in the UV-Visible region?

Test: Color & Electronic Spectra - Question 9

The violet color of iodine vapours is due to

Test: Color & Electronic Spectra - Question 10

The lowest energy d-d transition in the Cr(III) complexes varies in the order

Test: Color & Electronic Spectra - Question 11

The pale yellow color of [Mn(H2O)6]2+ is due to

*Multiple options can be correct
Test: Color & Electronic Spectra - Question 12

Which of the following compounds shown intervalence charge transfer transition

Test: Color & Electronic Spectra - Question 13

Among the species given, the one possessing charge-transfer transition in the visible region is:

Detailed Solution for Test: Color & Electronic Spectra - Question 13

 

"Among the species given, the one possessing charge-transfer transition in the visible region is:"

And the options are:

  • Option A: Th(C_2O_4)_3
  • Option D: [Cr(NCS)_6]^3-
  • Option C: ZnS
  • Option B: HgI_2

Charge-transfer transitions occur when an electron moves from a donor to an acceptor within the molecule. In the visible region, we typically look for species that have a metal center capable of undergoing such transitions due to their electronic configuration.

Among the options given:

  • Option A: Th(C_2O_4)_3 is a complex of thorium with oxalate ligands. Thorium is a f-block element, but the oxalate ligands typically do not participate in charge transfer with the visible region.

  • Option D: [Cr(NCS)_6]^3- is a complex of chromium with thiocyanate ligands. Chromium, being a d-block element, can have d-d transitions as well as charge-transfer transitions, especially with ligands like thiocyanate that can participate in such transitions. This makes it a likely candidate for visible region charge-transfer transitions.

  • Option C: ZnS is a semiconductor and generally does not show charge-transfer transitions in the visible region. It does have a band gap that can absorb UV light, but not typically visible light.

  • Option B: HgI_2 is mercury(II) iodide, and while heavy metal halides can have interesting electronic properties, they do not usually exhibit charge-transfer transitions in the visible region.

Based on this information, the species most likely to show charge-transfer transition in the visible region is Option D: [Cr(NCS)_6]^3-. This complex can exhibit charge-transfer transitions where the electron transfer occurs from the thiocyanate ligands to the chromium metal center.

Test: Color & Electronic Spectra - Question 14

Amongst the following, the strongest oxidizing anion is:

Test: Color & Electronic Spectra - Question 15

The compound which shows Metal to Ligand charge transfer is:

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