Coordination Compounds

When Ethane-1,2-diamine is added progressively to an aqueous solution of Nickel (II) chloride, the sequence of colour change observed will be:

1. Pale Blue Blue Green Violet
2. Pale Blue Blue Violet Green
3. Green Pale Blue Blue Violet
4. Violet Blue Pale Blue Green

The d-electronic configuration of an octahedral Co (II) complex having magnetic moment of 3.95 BM is:

1. e4t23
2. t2g6eg1
3. t2g5eg2
4. t2g3eg0

The complex that shows Facial - Meridional isomerism is :

1. [Co(en)2Cl2]+
2. [Co(NH3)3Cl3]
3. [Co(NH3)4Cl2]+
4. [Co(en)3]3+

Identify the coordination complexes in which the central metal ion has d4 configuration. Choose the correct answer from the options given below :

1. B, C and D only
2. C and E only
3. A, B and E only
4. B and D only

From the magnetic behaviour of [NiCl4]2- (paramagnetic) and [Ni(CO)4] (diamagnetic), choose the correct geometry and oxidation state.

1. [NiCl4]2- : Ni(0), tetrahedral [Ni(CO)4] : Ni(0), square planar
2. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : Ni(0), tetrahedral
3. [NiCl4]2- : NiII, tetrahedral [Ni(CO)4] : NiII, square planar
4. [NiCl4]2- : NiII, square planar [Ni(CO)4] : Ni(0), square planar

In which of the following complexes the CFSE, o will be equal to zero?

1. K3[Fe(SCN)6]
2. [Fe(en)3]Cl3
3. [Fe(NH3)6]Br2
4. K4[Fe(CN)6]

The correct order of the following complexes in terms of their crystal field stabilization energies is :

1. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(en)3]3+
2. [Co(NH3)4]2+ < [Co(NH3)6]2+ < [Co(en)3]3+ < [Co(NH3)6]3+
3. [Co(NH3)6]2+ < [Co(NH3)6]3+ < [Co(NH3)4]2+ < [Co(en)3]3+
4. [Co(en)3]3+ < [Co(NH3)6]3+ < [Co(NH3)6]2+ < [Co(NH3)4]2+

Identify the homoleptic complex(es) that is/are low spin. Choose the correct answer from the options given below :

1. C and D only
2. C only
3. A and C only
4. B and E only

The complex of Ni2+ ion and dimethyl glyoxime contains number of Hydrogen (H) atoms.