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Coordination Compounds · Question 30

NEET 2018MCQEasy📈 Topic in 38% papers+4−1
1

The geometry and magnetic behaviour of the complex [Ni(CO)4] are

  1. square planar geometry and diamagnetic
  2. tetrahedral geometry and diamagnetic
  3. square planar geometry and paramagnetic
  4. tetrahedral geometry and paramagnetic

Answer

(2) tetrahedral geometry and diamagnetic

Solution

In [Ni(CO)4], Ni is in the zero oxidation state: Ni(0) = [Ar] 3d8 4s2.

CO is a strong field ligand ⇒ the 4s electrons pair up in 3d ⇒ 3d10.

⇒ The empty 4s and three 4p orbitals give sp3 hybridisation.

Tetrahedral geometry, no unpaired electron ⇒ diamagnetic.

Answer: (2)

NEET 2018

Keep practising — Coordination Compounds

2

Iron carbonyl, Fe(CO)5 is

  1. tetranuclear
  2. mononuclear
  3. trinuclear
  4. dinuclear
NEET 2018
3

An example of a sigma bonded organometallic compound is

  1. Grignard's reagent
  2. ferrocene
  3. cobaltocene
  4. ruthenocene.
NEET 2017
4

The correct order of the stoichiometries of AgCl formed when AgNO3 in excess is treated with the complexes : CoCl3 6NH3, CoCl3 5NH3, CoCl3 4NH3 respectively is

  1. 3AgCl, 1AgCl, 2AgCl
  2. 3AgCl, 2AgCl, 1AgCl
  3. 2AgCl, 3AgCl, 2AgCl
  4. 1AgCl, 3AgCl, 2AgCl
NEET 2017
5

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co3+ is

  1. [Co(H2O)6]3+, [Co(en)3]3+, [Co(NH3)6]3+
  2. [Co(H2O)6]3+, [Co(NH3)6]3+, [Co(en)3]3+
  3. [Co(NH3)6]3+, [Co(en)3]3+, [Co(H2O)6]3+
  4. [Co(en)3]3+, [Co(NH3)6]3+, [Co(H2O)6]3+
NEET 2017
6

Pick out the correct statement with respect to [Mn(CN)6]3-.

  1. It is sp3d2 hybridised and tetrahedral.
  2. It is d2sp3 hybridised and octahedral.
  3. It is dsp2 hybridised and square planar.
  4. It is sp3d2 hybridised and octahedral.
NEET 2017
7

Which of the following has longest C-O bond length? (Free C-O bond length in CO is 1.128 Å.)

  1. [Fe(CO)4]2-
  2. [Mn(CO)6]+
  3. Ni(CO)4
  4. [Co(CO)4]-
NEET 2016 (Phase 1)
8

The correct increasing order of trans-effect of the following species is

  1. NH3 > CN- > Br- > C6H5-
  2. CN- > C6H5- > Br- > NH3
  3. Br- > CN- > NH3 > C6H5-
  4. CN- > Br- > C6H5- > NH3
NEET 2016 (Phase 2)
9

Jahn-Teller effect is not observed in high spin complexes of

  1. d7
  2. d8
  3. d4
  4. d9
NEET 2016 (Phase 2)
10

The hybridization involved in complex [Ni(CN)4]2- is (At. No. Ni = 28)

  1. sp3
  2. d2sp2
  3. d2sp3
  4. dsp2
AIPMT 2015
11

The name of complex ion, [Fe(CN)6]3- is

  1. hexacyanitoferrate (III) ion
  2. tricyanoferrate (III) ion
  3. hexacyanidoferrate (III) ion
  4. hexacyanoiron (III) ion.
AIPMT 2015

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