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Coordination Compounds

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

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)

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Ques. 2AIPMT 2011 (Prelims)

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
Ques. 3AIPMT 2011 (Prelims)

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+
Ques. 4AIPMT 2010 (Prelims)

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+
Ques. 5AIPMT 2010 (Prelims)

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
Ques. 6AIPMT 2010 (Prelims)

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.
Ques. 7AIPMT 2010 (Prelims)

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+
Ques. 8AIPMT 2009

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]+
Ques. 9AIPMT 2009

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+
Ques. 10AIPMT 2008

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+
Ques. 11AIPMT 2008

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+

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