Iron (ii) chloride solution is changed into Iron(iii) chloride solution after sometime, give a reason. ( 26Fe)

See explanation

Explanation:

When left to stand, a solution of  Iron II chloride is converted to Iron III chloride by oxidation in air.

The Iron III chloride is composed of weak field ligands in its coordination sphere. These weak field ligands mostly occur in a high spin configuration hence, the central iron atom can be converted from Fe[(H20)6]^2+ .2Cl^-(high spin d6) to Fe^3+[(H20)6]^3+ .3Cl^-(high spin d5).