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Coordination Compounds · Question 78

AIPMT 2005MCQMedium📈 Topic in 38% papers+4−1
1

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+

Answer

(3) [Co(NH3)6]3+

Solution

(1) Zn2+: 3d10 inner d orbitals full, sp3d2 (outer orbital), diamagnetic.

(2) Cr3+: 3d3 d2sp3 (inner orbital) but 3 unpaired electrons, paramagnetic.

(3) Co3+: 3d6; NH3 pairs the electrons d2sp3 (inner orbital), no unpaired electron, diamagnetic.

(4) Ni2+: 3d8 sp3d2 (outer orbital), 2 unpaired electrons, paramagnetic.

As per NCERT, [Co(NH3)6]3+ is an inner orbital, diamagnetic complex.

Answer: (3)

AIPMT 2005

Keep practising — Coordination Compounds

2

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
3

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
4

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
5

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
6

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
7

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
8

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
9

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004
10

Vitamin B12 contains

  1. Fe(II)
  2. Co(III)
  3. Zn(II)
  4. Ca(II)
AIPMT 2003
11

The number of unpaired electrons in the complex ion [CoF6]3- is (Atomic no. : Co = 27)

  1. 2
  2. 3
  3. 4
  4. zero
AIPMT 2003

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