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Coordination Compounds · Question 65

AIPMT 2011 (Prelims)MCQMedium📈 Topic in 38% papers+4−1
1

Which of the following complex compounds will exhibit highest paramagnetic behaviour?

  1. [Ti(NH3)6]3+
  2. [Cr(NH3)6]3+
  3. [Co(NH3)6]3+
  4. [Zn(NH3)6]2+

Answer

(2) [Cr(NH3)6]3+

Solution

Count the unpaired electrons:

Ti3+ (3d1): 1 unpaired electron

Cr3+ (3d3, t2g3): 3 unpaired electrons

Co3+ (3d6): as per NCERT, [Co(NH3)6]3+ is an inner orbital (d2sp3) low spin complex, t2g6: 0 unpaired electrons

Zn2+ ( 3d10): 0 unpaired electrons

[Cr(NH3)6]3+ ( = 15 3.87 BM) is the most paramagnetic.

Answer: (2)

AIPMT 2011 (Prelims)

Keep practising — Coordination Compounds

2

Which of the following complex ions is not expected to absorb visible light?

  1. [Ni(CN)4]2-
  2. [Cr(NH3)6]3+
  3. [Fe(H2O)6]2+
  4. [Ni(H2O)6]2+
AIPMT 2010 (Prelims)
3

Crystal field stabilization energy for high spin d4 octahedral complex is

  1. -1.8 0
  2. -1.6 0 + P
  3. -1.2 0
  4. -0.6 0
AIPMT 2010 (Prelims)
4

The existence of two different coloured complexes with the composition of [Co(NH3)4Cl2]+ is due to

  1. linkage isomerism
  2. geometrical isomerism
  3. coordination isomerism
  4. ionization isomerism.
AIPMT 2010 (Prelims)
5

Which one of the following complexes is not expected to exhibit isomerism?

  1. [Ni(NH3)4(H2O)2]2+
  2. [Pt(NH3)2Cl2]
  3. [Ni(NH3)2Cl2]
  4. [Ni(en)3]2+
AIPMT 2010 (Prelims)
6

Which of the following does not show optical isomerism? (en = ethylenediamine)

  1. [Co(NH3)3Cl3]0
  2. [Co(en)Cl2(NH3)2]+
  3. [Co(en)3]3+
  4. [Co(en)2Cl2]+
AIPMT 2009
7

Which of the following complex ions is expected to absorb visible light? (At. nos. Zn = 30, Sc = 21, Ti = 22, Cr = 24)

  1. [Ti(en)2(NH3)2]4+
  2. [Cr(NH3)6]3+
  3. [Zn(NH3)6]2+
  4. [Sc(H2O)3(NH3)3]3+
AIPMT 2009
8

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+
AIPMT 2008
9

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
10

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
11

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

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