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Coordination Compounds · Question 72

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

Which of the following complexes exhibits the highest paramagnetic behaviour? where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties. (At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)

  1. [Co(ox)2(OH)2]-
  2. [Ti(NH3)6]3+
  3. [V(gly)2(OH)2(NH3)2]+
  4. [Fe(en)(bpy)(NH3)2]2+

Answer

(1) [Co(ox)2(OH)2]-

Solution

Paramagnetism increases with the number of unpaired electrons on the metal ion.

(1) [Co(ox)2(OH)2]-: x + 2(-2) + 2(-1) = -1 x = +5; Co5+ is 3d4; ox and OH- are weak field ligands (high spin) 4 unpaired electrons.

(2) [Ti(NH3)6]3+: Ti3+ is 3d1 1 unpaired electron.

(3) [V(gly)2(OH)2(NH3)2]+: x + 2(-1) + 2(-1) + 0 = +1 x = +5; V5+ is 3d0 0 unpaired electrons.

(4) [Fe(en)(bpy)(NH3)2]2+: Fe2+ is 3d6; en and bpy are strong field ligands, so the electrons pair up ( t2g6eg0) 0 unpaired electrons.

[Co(ox)2(OH)2]- has the most unpaired electrons and shows the highest paramagnetism.

Answer: (1)

AIPMT 2008

Keep practising — Coordination Compounds

2

In which of the following coordination entities the magnitude of o (CFSE in octahedral field) will be maximum? (At. No. Co = 27)

  1. [Co(CN)6]3-
  2. [Co(C2O4)3]3-
  3. [Co(H2O)6]3+
  4. [Co(NH3)6]3+
AIPMT 2008
3

Which of the following will give a pair of enantiomorphs? (en = NH2CH2CH2NH2)

  1. [Cr(NH3)6][Co(CN)6]
  2. [Co(en)2Cl2]Cl
  3. [Pt(NH3)4][PtCl6]
  4. [Co(NH3)4Cl2]NO2
AIPMT 2007
4

The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

  1. [Fe(H2O)6]2+
  2. [Ni(H2O)6]2+
  3. [Cr(H2O)6]2+
  4. [Mn(H2O)6]2+
AIPMT 2007
5

[Cr(H2O)6]Cl3 (At. no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

  1. 3d1xy, 3d1yz, 3d1z2
  2. 3d1(x2-y2), 3d1z2, 3d1xz
  3. 3d1xy, 3d1(x2-y2), 3d1yz
  4. 3d1xy, 3d1yz, 3d1xz
AIPMT 2006
6

[Co(NH3)4(NO2)2]Cl exhibits

  1. linkage isomerism, geometrical isomerism and optical isomerism
  2. linkage isomerism, ionization isomerism and optical isomerism
  3. linkage isomerism, ionization isomerism and geometrical isomerism
  4. ionization isomerism, geometrical isomerism and optical isomerism.
AIPMT 2006
7

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

  1. [Zn(NH3)6]2+
  2. [Cr(NH3)6]3+
  3. [Co(NH3)6]3+
  4. [Ni(NH3)6]2+
AIPMT 2005
8

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

  1. cis-[Pt(NH3)2Cl2]
  2. trans-[Pt(NH3)2Cl2]
  3. cis-[Co(en)2Cl2]+
  4. trans-[Co(en)2Cl2]+
AIPMT 2005
9

Which of the following coordination compounds would exhibit optical isomerism?

  1. Pentaamminenitrocobalt (III) iodide
  2. Diamminedichloroplatinum (II)
  3. trans-Dicyanobis (ethylenediamine) chromium (III) chloride
  4. tris-(Ethylenediamine) cobalt (III) bromide.
AIPMT 2004
10

Among [Ni(CO)4], [Ni(CN)4]2-, [NiCl4]2- species, the hybridisation states at the Ni atom are, respectively [Atomic number of Ni = 28]

  1. sp3, dsp2, dsp2
  2. sp3, dsp2, sp3
  3. sp3, sp3, dsp2
  4. dsp2, sp3, sp3
AIPMT 2004
11

CN- is a strong field ligand. This is due to the fact that

  1. it carries negative charge
  2. it is a pseudohalide
  3. it can accept electrons from metal species
  4. it forms high spin complexes with metal species.
AIPMT 2004

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