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Coordination Compounds

AIPMT 2006MCQMedium📈 Topic in 12% papers+4−1
Ques. 1AIPMT 2006

[Cr(H2O)6]Cl3 (At. no. of Cr = 24) has a magnetic moment of 3.83 B.M. The correct distribution of 3d electrons in the chromium of the complex is

  1. 3d1xy, 3d1yz, 3d1z2
  2. 3d1(x2-y2), 3d1z2, 3d1xz
  3. 3d1xy, 3d1(x2-y2), 3d1yz
  4. 3d1xy, 3d1yz, 3d1xz

Answer

(4) 3d1xy, 3d1yz, 3d1xz

Solution

Oxidation state of Cr: x + 6(0) - 3 = 0 ⇒ x = +3

Cr3+: [Ar] 3d3

= n(n+2) = 3.83 B.M. ⇒ n = 3 unpaired electrons

In an octahedral field the d orbitals split into t2g ( dxy, dyz, dxz, lower energy) and eg ( dx2-y2, dz2, higher energy).

∴ The three electrons occupy the t2g set singly: t2g3 eg0, i.e. 3d1xy, 3d1yz, 3d1xz.

Answer: (4)

Keep practising — Coordination Compounds

Ques. 2AIPMT 2006

[Co(NH3)4(NO2)2]Cl exhibits

  1. linkage isomerism, geometrical isomerism and optical isomerism
  2. linkage isomerism, ionization isomerism and optical isomerism
  3. linkage isomerism, ionization isomerism and geometrical isomerism
  4. ionization isomerism, geometrical isomerism and optical isomerism.
Ques. 3AIPMT 2005

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

  1. [Zn(NH3)6]2+
  2. [Cr(NH3)6]3+
  3. [Co(NH3)6]3+
  4. [Ni(NH3)6]2+
Ques. 4AIPMT 2005

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

  1. cis-[Pt(NH3)2Cl2]
  2. trans-[Pt(NH3)2Cl2]
  3. cis-[Co(en)2Cl2]+
  4. trans-[Co(en)2Cl2]+
Ques. 5AIPMT 2004

Which of the following coordination compounds would exhibit optical isomerism?

  1. Pentaamminenitrocobalt (III) iodide
  2. Diamminedichloroplatinum (II)
  3. trans-Dicyanobis (ethylenediamine) chromium (III) chloride
  4. tris-(Ethylenediamine) cobalt (III) bromide.
Ques. 6AIPMT 2004

Among [Ni(CO)4], [Ni(CN)4]2-, [NiCl4]2- species, the hybridisation states at the Ni atom are, respectively [Atomic number of Ni = 28]

  1. sp3, dsp2, dsp2
  2. sp3, dsp2, sp3
  3. sp3, sp3, dsp2
  4. dsp2, sp3, sp3
Ques. 7AIPMT 2004

CN- is a strong field ligand. This is due to the fact that

  1. it carries negative charge
  2. it is a pseudohalide
  3. it can accept electrons from metal species
  4. it forms high spin complexes with metal species.
Ques. 8AIPMT 2004

Considering H2O as a weak field ligand, the number of unpaired electrons in [Mn(H2O)6]2+ will be (atomic number of Mn = 25)

  1. three
  2. five
  3. two
  4. four
Ques. 9AIPMT 2004

Which of the following does not have a metal carbon bond?

  1. Al(OC2H5)3
  2. C2H5MgBr
  3. K[Pt(C2H4)Cl3]
  4. Ni(CO)4
Ques. 10AIPMT 2004

In an octahedral structure, the pair of d orbitals involved in d2sp3 hybridisation is

  1. dx2-y2, dz2
  2. dxz, dx2-y2
  3. dz2, dxz
  4. dxy, dyz
Ques. 11AIPMT 2004

Which of the following is considered to be an anticancer species?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]

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