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Coordination Compounds

AIPMT 2001MCQHard📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2001

Which of the following will give maximum number of isomers?

  1. [Co(NH3)4Cl2]
  2. [Ni(en)(NH3)4]2+
  3. [Ni(C2O4)(en)2]
  4. [Cr(SCN)2(NH3)4]+

Answer

(4) [Cr(SCN)2(NH3)4]+

Solution

(1) [Co(NH3)4Cl2], type [MA4B2]: cis and trans, i.e. 2 isomers.

(2) [Ni(en)(NH3)4]2+, type [M(AA)B4]: no isomer, i.e. 1 form only.

(3) [Ni(C2O4)(en)2], type [M(AA)2(BB)]: trans + cis (d and l), i.e. 3 isomers.

(4) [Cr(SCN)2(NH3)4]+: geometrical isomers cis and trans; besides, SCN is an ambidentate ligand (S- or N-bonded), so linkage isomers are also possible: both –SCN, one –SCN + one –NCS, both –NCS.

Total isomers = 2 3 = 6

[Cr(SCN)2(NH3)4]+ gives the maximum number of isomers.

Answer: (4)

Keep practising — Coordination Compounds

Ques. 2AIPMT 2001

Coordination number of Ni in [Ni(C2O4)3]4- is

  1. 3
  2. 6
  3. 4
  4. 2
Ques. 3AIPMT 2001

Which of the following organometallic compounds is and bonded?

  1. [Fe( 5-C5H5)2]
  2. K[PtCl3( 2-C2H4)]
  3. [Co(CO)5NH3]2+
  4. Fe(CH3)3
Ques. 4AIPMT 2001

Which statement is incorrect?

  1. Ni(CO)4 – tetrahedral, paramagnetic
  2. [Ni(CN)4]2- – square planar, diamagnetic
  3. Ni(CO)4 – tetrahedral, diamagnetic
  4. [NiCl4]2- – tetrahedral, paramagnetic.
Ques. 5AIPMT 2001

Which of the following will exhibit maximum ionic conductivity?

  1. K4[Fe(CN)6]
  2. [Co(NH3)6]Cl3
  3. [Cu(NH3)4]Cl2
  4. [Ni(CO)4]
Ques. 6AIPMT 2000

In qualitative analysis of second group in laboratory, H2S gas is passed in acidic medium for precipitation. When Cu2+ and Cd2+ react with KCN, then for product, true statement is

  1. K2[Cu(CN)4] – more stable; K2[Cd(CN)4] – less stable
  2. K2[Cu(CN)4] – less stable; K2[Cd(CN)4] – more stable
  3. K3[Cu(CN)4] – more stable; K2[Cd(CN)4] – less stable
  4. K3[Cu(CN)4] – less stable; K3[Cd(CN)4] – more stable
Ques. 7AIPMT 2000

Shape of Fe(CO)5 is

  1. octahedral
  2. square planar
  3. trigonal bipyramidal
  4. square pyramidal
Ques. 8AIPMT 2000

Which complex compound will give four isomers?

  1. [Fe(en)3]Cl3
  2. [Co(en)(NH3)2Cl2]Cl
  3. [Fe(PPh3)3NH3ClBr]Cl
  4. [Co(PPh3)3Cl]Cl3

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