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Coordination Compounds · Question 76

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

[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)

AIPMT 2006

Keep practising — Coordination Compounds

2

[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.
AIPMT 2006
3

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+
AIPMT 2005
4

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]+
AIPMT 2005
5

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.
AIPMT 2004
6

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
AIPMT 2004
7

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.
AIPMT 2004
8

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
AIPMT 2004
9

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
AIPMT 2004
10

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
AIPMT 2004
11

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004

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