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Coordination Compounds · Question 36

NEET 2016 (Phase 1)MCQMedium📈 Topic in 25% papers+4−1
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]-

Answer

(1) [Fe(CO)4]2-

Solution

As per NCERT, the metal–carbon bond in metal carbonyls has both σ and π character: the filled metal d orbital donates electrons into the vacant antibonding π* orbital of CO (synergic bonding / back bonding).

More electron density on the metal ⇒ more back donation into π* of CO ⇒ lower C–O bond order ⇒ longer C–O bond.

Oxidation states: Fe in [Fe(CO)4]2- = −2; Co in [Co(CO)4]- = −1; Ni in Ni(CO)4 = 0; Mn in [Mn(CO)6]+ = +1.

∴ Back bonding is maximum in [Fe(CO)4]2-, so its C–O bond is the longest.

Answer: (1)

NEET 2016 (Phase 1)

Keep practising — Coordination Compounds

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
NEET 2016 (Phase 2)
3

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

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

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

  1. sp3
  2. d2sp2
  3. d2sp3
  4. dsp2
AIPMT 2015
5

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
6

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
AIPMT 2015
7

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

  1. 1
  2. 3
  3. 4
  4. 2
AIPMT 2015
8

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
AIPMT 2015 (Cancelled)
9

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.
AIPMT 2015 (Cancelled)
10

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+
AIPMT 2014
11

Which of the following complexes is used as an anticancer agent?

  1. mer-[Co(NH3)3Cl3]
  2. cis-[PtCl2(NH3)2]
  3. cis-K2[PtCl2Br2]
  4. Na2CoCl4
AIPMT 2014

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