Question

Complex ion $[NiC{l}_6{]}^{4-},[Ni(CN{)}_6{]}^{4-}$ similar in their given properties:

• A. Oxidation state, geometry
• B. Co-ordination number, EAN
• C. Magnetic moment, geometry
• D. Stability, colour

Answer 1

Answer: (A), (B), (C)

Magnetic moment, geometry
Oxidation state, geometry
Co-ordination number, EAN

In both complexes $\left[NiC{l}_6{]}^{4-}and\right[Ni(CN{)}_6{]}^{4-}$, the oxidation state of nickel s +2.

They have octahedral geometry.

The coordination number of nickel is 6 as six ligands are attached.

The EAN is $EAN=Z-X+Y=28-2+12=38$.

Th outer electronic configuration of $N{i}^{+2}$ is $3d^8$.

Both contains 2 unpaired electrons and are paramagnetic in nature. The spin only magnetic moment has value $\sqrt{8}B.M.$.

Thus options A, B and C are correct.

They contain different ligands which have different field strength and hence differ in the stability and colour.