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Coordination Compounds · Question 63

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

The d-electron configurations of Cr2+, Mn2+, Fe2+ and Co2+ are d4, d5, d6 and d7 respectively. Which one of the following will exhibit minimum paramagnetic behaviour? (At. Nos. Cr = 24, Mn = 25, Fe = 26, Co = 27)

  1. [Mn(H2O)6]2+
  2. [Fe(H2O)6]2+
  3. [Co(H2O)6]2+
  4. [Cr(H2O)6]2+

Answer

(3) [Co(H2O)6]2+

Solution

H2O is a weak field ligand, so all four are high spin (outer orbital) complexes and the d electrons stay unpaired as far as possible.

Mn2+ (d5): 5 unpaired electrons

Fe2+ (d6): 4 unpaired electrons

Co2+ (d7): 3 unpaired electrons

Cr2+ (d4): 4 unpaired electrons

= n(n+2) BM, fewest unpaired electrons means minimum paramagnetism.

[Co(H2O)6]2+ ( = 15 3.87 BM) is the least paramagnetic.

Answer: (3)

AIPMT 2011 (Prelims)

Keep practising — Coordination Compounds

2

Which of the following carbonyls will have the strongest C–O bond?

  1. Mn(CO)6+
  2. Cr(CO)6
  3. V(CO)6-
  4. Fe(CO)5
AIPMT 2011 (Prelims)
3

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+
AIPMT 2011 (Prelims)
4

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)
5

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)
6

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)
7

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)
8

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
9

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
10

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
11

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

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