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Coordination Compounds · Question 81

AIPMT 2004MCQMedium📈 Topic in 38% papers+4−1
1

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

Answer

(2) sp3, dsp2, sp3

Solution

[Ni(CO)4]: Ni(0) is 3d84s2; CO is a strong field ligand, the 4s electrons are paired into 3d, giving 3d10.

The empty 4s and 4p orbitals accept the four CO pairs: sp3, tetrahedral.

[Ni(CN)4]2-: Ni2+ is 3d8; strong field CN- pairs the two unpaired electrons, leaving one 3d orbital empty.

One 3d, one 4s and two 4p orbitals hybridise: dsp2, square planar (diamagnetic).

[NiCl4]2-: Cl- is a weak field ligand, so no pairing occurs in 3d8 (two unpaired electrons).

4s and three 4p orbitals are used: sp3, tetrahedral (paramagnetic).

Answer: (2)

AIPMT 2004

Keep practising — Coordination Compounds

2

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
3

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
4

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
5

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
6

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

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
AIPMT 2004
7

Vitamin B12 contains

  1. Fe(II)
  2. Co(III)
  3. Zn(II)
  4. Ca(II)
AIPMT 2003
8

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
9

Among the following which is not the -bonded organometallic compound?

  1. K[PtCl3( 2-C2H4)]
  2. Fe( 5-C5H5)2
  3. Cr( 6-C6H6)2
  4. (CH3)4Sn
AIPMT 2003
10

Atomic number of Cr and Fe are respectively 24 and 26, which of the following is paramagnetic with the spin of electron?

  1. [Cr(CO)6]
  2. [Fe(CO)5]
  3. [Fe(CN)6]4-
  4. [Cr(NH3)6]3+
AIPMT 2002
11

The hypothetical complex chloro diaquatriammine cobalt(III) chloride can be represented as

  1. [CoCl(NH3)3(H2O)2]Cl2
  2. [Co(NH3)3(H2O)Cl3]
  3. [Co(NH2)3(H2O)2Cl]
  4. [Co(NH3)3(H2O)3]Cl3
AIPMT 2002

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