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Coordination Compounds · Question 92

AIPMT 2002MCQMedium📈 Topic in 0% papers+4−1
1

In the silver plating of copper, K[Ag(CN)2] is used instead of AgNO3. The reason is

  1. a thin layer of Ag is formed on Cu
  2. more voltage is required
  3. Ag+ ions are completely removed from solution
  4. less availability of Ag+ ions, as Cu cannot displace Ag from [Ag(CN)2]- ion.

Answer

(4) less availability of Ag+ ions, as Cu cannot displace Ag from [Ag(CN)2]- ion.

Solution

E ( Cu2+/Cu) = +0.34 V < E (Ag+/Ag) = +0.80 V, copper displaces silver from AgNO3 solution:

Cu + 2Ag+ Cu2+ + 2Ag

This gives a loose, non-adherent deposit.

In K[Ag(CN)2], silver is held in the very stable complex [Ag(CN)2]-, so the concentration of free Ag+ is very low and Cu cannot displace Ag from it.

Silver deposits slowly and only by electrolysis, giving a smooth, uniform and adherent coating.

Answer: (4)

AIPMT 2002

Keep practising — Coordination Compounds

2

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]
AIPMT 2002
3

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
4

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

  1. 3
  2. 6
  3. 4
  4. 2
AIPMT 2001
5

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
6

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
7

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
8

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
9

Shape of Fe(CO)5 is

  1. octahedral
  2. square planar
  3. trigonal bipyramidal
  4. square pyramidal
AIPMT 2000
10

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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