Coordination Compounds

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+

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.

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]-

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

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

1. d7
2. d8
3. d4
4. d9

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

1. sp3
2. d2sp2
3. d2sp3
4. dsp2

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.

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

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

1. 1
2. 3
3. 4
4. 2

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