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Coordination Compounds · Question 75

AIPMT 2007MCQEasy📈 Topic in 38% papers+4−1
1

The d electron configurations of Cr2+, Mn2+, Fe2+ and Ni2+ are 3d4, 3d5, 3d6 and 3d8 respectively. Which one of the following aqua complexes will exhibit the minimum paramagnetic behaviour? (At. No. Cr = 24, Mn = 25, Fe = 26, Ni = 28)

  1. [Fe(H2O)6]2+
  2. [Ni(H2O)6]2+
  3. [Cr(H2O)6]2+
  4. [Mn(H2O)6]2+

Answer

(2) [Ni(H2O)6]2+

Solution

H2O is a weak field ligand ⇒ no pairing beyond Hund's rule (high spin).

Unpaired electrons: Cr2+ (3d4) = 4, Mn2+ (3d5) = 5, Fe2+ (3d6) = 4, Ni2+ (3d8) = 2

= n(n+2) BM is least for the smallest n.

∴ [Ni(H2O)6]2+ ( = 8 = 2.83 BM) is the least paramagnetic.

Answer: (2)

AIPMT 2007

Keep practising — Coordination Compounds

2

[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
AIPMT 2006
3

[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
4

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
5

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
6

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
7

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
8

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
9

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
10

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
11

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

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