Color & Electronic Spectra MCQs for CSIR NET & GATE | Download PDF

Color & Electronic Spectra MCQs
for CSIR NET & GATE

Coordination Compounds
Topic Wise assignment 6

QUIZ        PDF

Q1. Which one of the following complex ions shows minimum intensity of absorption in the UV-Visible region?

          (a) [Cr(H₂O)₆]²⁺
          (b) [V(H₂O)₆]²⁺
          (c) [Mn(H₂O)₆]²⁺
          (d) [Co(H₂O)₆]²⁺

Q2. Among the species given, the one possessing charge-transfer transition in the visible region is:

          (a) Th(C₂O₄)₃
          (b) [Cr(NCS)₆]^3-
          (c) ZnS
          (d) HgI₂

Q3. The complex which exhibits lowest energy electronic absorption band is:

[GATE 2000]

          (a) [NiCl₄]^2-
          (b) [Ni(H₂O)₆]²⁺
          (c) [Ni(CN)₄]^2-
          (d) [Ni(CO)₄]

Q4. Amongst the following, the strongest oxidizing anion is:

[GATE 2001]

          (a) CrO₄^2-
          (b) VO₄^3-
          (c) FeO₄^2-
          (d) MnO₄^2-

Q5. The absorption of [Co(NH₃)₆]²⁺ is:

[GATE 2004]

(a) Stronger than that of [Co(NH₃)₅Cl]²⁺
(b) Stronger than that of [MnCl₄]^2-
(c) Weaker than that of [MnCl₄]^2-mbut stronger than that of [Co(NH₃)₅Cl]²⁺
(d) Weaker than those of [MnCl₄]^2- & [Co(NH₃)₅Cl]²⁺ both

Q6. The compound which shows Metal to Ligand charge transfer is:

          (a) Ni(CO)₄
          (b) K₂Cr₂O₇
          (c) HgO
          (d) [Ni(H₂O)₆]²⁺

Q7. The compound that absorbs the light of the longest wavelength is

          (a) [Cr(NO₂)₆]^3-
          (b) [Cr(NH₃)₆]³⁺
          (c) [Cr(H₂O)₆]³⁺
          (d) [CrF₆]^3-

Q8. Which of the following compounds shown intervalence charge transfer transition

          (a) Pb₃O₄
          (b) KCr₂O₇
          (c) KFe[Fe(CN)₆]
          (d) Mn₂(CO)₁₀

Q9. The bright yellow color of [Cu(phen)₂]⁺ (phen=1, 10-phenanthroline) is due to

(a) d-d transition
(b) metal to ligand chare transfer
(c) ligan to metal charge transfer
(d) π to π* transition in the phenanthroline ligand

Q10. The pale yellow color of [Mn(H₂O)₆]²⁺ is due to

(a) spin forbidden d-d transition
(b) metal to ligand charge transfer
(c) ligand to metal charge transfer
(d) intra ligand excitation

Q11. The molar absorptivity at λmax is minimum for

          (a) [Mn(H₂O)]²⁺
          (b) [Cr(H₂O)]²⁺
          (c) [Co(H₂O)]²⁺
          (d) [Fe(H₂O)]²⁺

Q12. The lowest energy d-d transition in the Cr(III) complexes varies in the order

[GATE 2002]

(a) CrCl₆^3- < Cr(H₂O)₆³⁺ < Cr(en)₃³⁺ < Cr(CN)₆^3-
(b) CrCl₆^3- < Cr(en)₃³⁺ < Cr(H₂O)₆³⁺ < Cr(CN)₆^3-
(c) Cr(CN)₆^3- < CrCl₆^3- < Cr(H₂O)₆³⁺ < Cr(en)₃³⁺
(d) Cr(H₂O)₆³⁺ < Cr(en)₃³⁺ < CrCl₆^3- < Cr(CN)₆^3-

Q13. [CoCl₄]^2- shows a deep blue color because of

(a) Metal to ligand charge transfer transition
(b) Ligand to metal charge transfer transition
(c) Spin allowed and Laporte forbidden d-d transition
(d) Spin & Laporte allowed d-d transition

Q14. The violet color of iodine vapours is due to

          (a) n-π* transition
          (b) π-π* transition
          (c) n-π* transition
          (d) π*-σ* transition

Q15. The red color of oxyhaemoglobin is mainly due to the

(a) d-d transition
(b) metal to ligand charge transfer transition
(c) ligand to metal charge transfer transition
(d) Intra Ligand π-π* transition

Answer Key

1.c 2.d 3.a 4.d 5.b 6.a 7.d 8.a,c 9.b 10.a 11.a 12.a 13.c 14.d 15.d

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