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Coordination Chemistry

Coordination Chemistry: Crystal Field Theory, Ligands, and Complex Properties

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Questions

Question 1 Multiple Choice (Single Answer)

Which of the following is/are high spin complexes?

  1. [Fe(H2O)6]2+
  2. [Fe(CN)6]4-
  3. [CrF6]3-
  4. [Cr(NH3)6]3+
  1. Only 1 and 3
  2. Only 2 and 4
  3. Only 1 and 2
  4. Only 2 and 3
  5. Only 3 and 4
Question 2 Multiple Choice (Single Answer)

Which of the following sets have only bidentate ligands?

  1. C2O42-, acac, dien, NO2-
  2. EDTA, en, acac, SCN-
  3. en, C2O42-, acac, dmpe
  4. EDTA, dmpe, SCN- , NO2-
  5. dien, acac, dmpe, C2O42-
Question 3 Multiple Choice (Single Answer)

Which of the following complexes, largest crystal field splitting occurs in

  1. [Co(en)3]3+
  2. [Co(H2O)6]3+
  3. [Co(CN)6]3-
  4. [Co(NH3)6]3+
  5. [CoCl6]3-
Question 4 Multiple Choice (Single Answer)

Which of the following ligands cannot form a chelate complex?

  1. EDTA
  2. Oxalate
  3. Sulphate
  4. Ethylenediamine
  5. Thiocyanate
Question 5 Multiple Choice (Single Answer)

Which of the following statements is not true?

  1. Central metal atoms/ions in coordination complexes are Lewis acids.
  2. The secondary valency represents oxidation number of the central metal ion.
  3. Ligands are Lewis bases.
  4. Coordination number of cobalt in the compound [Co(ox)3]3- is 6.
  5. Oxidation number of cobalt in complex ion [CoCl2(en)2]+ is +3
Question 6 Multiple Choice (Single Answer)

Which of the following is an organometallic compound?

  1. Lithiumhydride
  2. Lithium ethoxide
  3. Lithium propnoate
  4. Lithium dimethylamide
  5. Tert-butyllithium
Question 7 Multiple Choice (Single Answer)

Which of the following is not correctly matched?

  1. Ziggler Natta catalyst - Polymerisation of alkenes
  2. [Pt Cl2(NH3)2] - Cancer treatment
  3. [Ni(CO)4] - Purification of Ni by Mond’s process
  4. RhCl(PPh3)3 - Dehydrogenation of alkenes
  1. Only 1
  2. Only 1 and 2
  3. Only 2 and 3
  4. Only 4
  5. Only 1 and 4
Question 8 Multiple Choice (Single Answer)

Which of the following is a pair of square planar complexes?

  1. [PtCl4]2- and [ZnCl4]2-
  2. [Ni(CN)4]2- and [CoCl4]2-
  3. [ZnCl4]2- and [Ni(CN)4]2-
  4. [CoCl4]2- and [PtCl4]2-
  5. [PtCl4]2- and [Ni(CN)4]2-
Question 9 Multiple Choice (Single Answer)

Which of following is a low spin complex?
1. [Co(H2O)6]3+
2. [Ni(CN)4]2-
3. [CoF6]3-

  1. Only 1
  2. Only 2
  3. Only 3
  4. Only 2 and 3
  5. All of these
Question 10 Multiple Choice (Single Answer)

Which of the following correctly places the ligands in their order in the spectrochemical series?

  1. I– < CN– < SCN– < en
  2. I− < SCN− < OH− < en
  3. SCN− < OH− < I− < CO
  4. en < OH− < I− < CN–
  5. F– < Cl– < Br–< I–
Question 11 Multiple Choice (Single Answer)

Which of the following is/are outer orbital complex?
1. [Co(NH3)6]3+
2. [Fe(CN)6]3-
3. [FeF6]3–

  1. Only 1 and 2
  2. Only 2 and 3
  3. Only 1 and 3
  4. Only 3
  5. All of these
Question 12 Multiple Choice (Single Answer)

Which of the following pairs of transition metal complexes have highest magnetic moment?

  1. [Fe(SCN)6]-4 and [Fe(SCN)6]-3
  2. [Zn(H2O)6]+2 and [Pt(Cl)4]-2
  3. [Ni(CN)4]-2 and Co(NH3)6]+2
  4. [Cr(NH3)6]+3 and [Co(NH3)6]+3
  5. [Co(H2O)6]+3 and [Fe(H2O)6]+2
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