The primary valency of ‘Fe’ in the complex ${\mathrm{K}}_4\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$ is

The primary valency of Fe in the complex K₄[Fe(CN)₆] refers to the oxidation state of the iron (Fe) atom. To determine the primary valency of Fe, we analyze the overall charge of the complex and consider the contributions from each component.

Step-by-Step Calculation

1. The potassium ions (K⁺) contribute a total charge of +4, as there are 4 K⁺ ions.
2. The cyanide ligands (CN^-) each carry a charge of -1. Since there are 6 CN^- ligands, they contribute a total charge of -6.
3. Let the oxidation state (primary valency) of Fe be x.

The sum of the charges in the complex is neutral (0). Therefore, we can write the equation:

4(+1) + x + 6(-1) = 0

Solving this equation:

• 4 + x - 6 = 0
• x = +2

Conclusion

The primary valency of Fe in the complex K₄[Fe(CN)₆] is +2. This indicates that the iron atom (Fe) is in the +2 oxidation state in this coordination compound.

Understanding the Valency of Fe

The valency of Fe in this complex also determines its bonding and interaction with ligands. The secondary valency, which represents the coordination number of Fe, is 6, corresponding to the 6 cyanide (CN^-) ligands attached to Fe.

In summary, the valency of Fe in K₄[Fe(CN)₆] plays a crucial role in defining the chemical properties and structure of this coordination compound.

Do Check: 

1. Coordination Compounds Class 12 Notes Chemistry Chapter 9
2. Class 12 Chemistry MCQ for Coordination Compounds
3. Important Questions for Class 12 Chemistry Chapter 9 Coordination Compounds