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Coordination Compounds · Question 93

AIPMT 2002MCQMedium📈 Topic in 25% papers+4−1
1

CuSO4 when reacts with KCN forms CuCN, which is insoluble in water. It is soluble in excess of KCN, due to formation of the following complex

  1. K2[Cu(CN)4]
  2. K3[Cu(CN)4]
  3. CuCN2
  4. Cu[KCu(CN)4]

Answer

(2) K3[Cu(CN)4]

Solution

2CuSO4 + 4KCN 2Cu(CN)2 + 2K2SO4

2Cu(CN)2 2CuCN + (CN)2 (Cu(II) is reduced to Cu(I))

With excess KCN, CuCN dissolves forming a soluble Cu(I) complex:

CuCN + 3KCN K3[Cu(CN)4]

Check: Cu(+1) + 4(−1) = −3 [Cu(CN)4]3- needs 3 K+.

Answer: (2)

AIPMT 2002

Keep practising — Coordination Compounds

2

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]+
AIPMT 2001
3

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

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

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
AIPMT 2001
5

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.
AIPMT 2001
6

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]
AIPMT 2001
7

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
AIPMT 2000
8

Shape of Fe(CO)5 is

  1. octahedral
  2. square planar
  3. trigonal bipyramidal
  4. square pyramidal
AIPMT 2000
9

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
AIPMT 2000

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