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Coordination Compounds

AIPMT 2002MCQMediumNot asked in last 5 yrs+4−1
Ques. 1AIPMT 2002

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)

Keep practising — Coordination Compounds

Ques. 2AIPMT 2002

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]
Ques. 3AIPMT 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]+
Ques. 4AIPMT 2001

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

  1. 3
  2. 6
  3. 4
  4. 2
Ques. 5AIPMT 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. 6AIPMT 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. 7AIPMT 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. 8AIPMT 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. 9AIPMT 2000

Shape of Fe(CO)5 is

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