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Coordination Compounds

NEET 2017MCQEasy📈 Topic in 38% papers+4−1
Ques. 1NEET 2017

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.

Answer

(2) It is d2sp3 hybridised and octahedral.

Solution

In [Mn(CN)6]3- the oxidation state of Mn is +3, so Mn3+ is [Ar] 3d4.

CN- is a strong field ligand, the four 3d electrons pair up in three 3d orbitals, leaving two 3d orbitals vacant. Two 3d, one 4s and three 4p orbitals then hybridise to give d2sp3 (inner orbital complex), so the six CN- ligands are arranged octahedrally, and the complex has 2 unpaired electrons (paramagnetic).

As per NCERT, [Mn(CN)6]3- is an inner orbital, d2sp3 hybridised, octahedral complex.

Answer: (2)

Keep practising — Coordination Compounds

Ques. 2NEET 2016 (Phase 1)

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]-
Ques. 3NEET 2016 (Phase 2)

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
Ques. 4NEET 2016 (Phase 2)

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

  1. d7
  2. d8
  3. d4
  4. d9
Ques. 5AIPMT 2015

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

  1. sp3
  2. d2sp2
  3. d2sp3
  4. dsp2
Ques. 6AIPMT 2015

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.
Ques. 7AIPMT 2015

The sum of coordination number and oxidation number of the metal M in the complex [M(en)2(C2O4)]Cl (where en is ethylenediamine) is

  1. 6
  2. 7
  3. 8
  4. 9
Ques. 8AIPMT 2015

Number of possible isomers for the complex [Co(en)2Cl2]Cl will be (en = ethylenediamine)

  1. 1
  2. 3
  3. 4
  4. 2
Ques. 9AIPMT 2015 (Cancelled)

Cobalt (III) chloride forms several octahedral complexes with ammonia. Which of the following will not give test for chloride ions with silver nitrate at 25 ?

  1. CoCl3 5NH3
  2. CoCl3 6NH3
  3. CoCl3 3NH3
  4. CoCl3 4NH3
Ques. 10AIPMT 2015 (Cancelled)

Which of these statements about [Co(CN)6]3- is true?

  1. [Co(CN)6]3- has four unpaired electrons and will be in a high-spin configuration.
  2. [Co(CN)6]3- has no unpaired electrons and will be in a high-spin configuration.
  3. [Co(CN)6]3- has no unpaired electrons and will be in a low-spin configuration.
  4. [Co(CN)6]3- has four unpaired electrons and will be in a low-spin configuration.
Ques. 11AIPMT 2014

Among the following complexes the one which shows zero crystal field stabilization energy (CFSE) is

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

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