Explain different oxidation states of chromium. – InterviewSolution

1.	Explain different oxidation states of chromium.
Answer» The observed electronic configuration of chromium is, ₂₄Cr [Ar] 3d⁵4s¹. Different possible oxidation states of Cr are 4-1 (3d⁵), + 2 (3d⁴), + 3 (3d³), + 4 (3d²), + 5 (3d¹) and + 6 (3d°). Although in + 1 state, Cr gets extra stability of half-filled 3d⁵ -orbital, it does not exhibit + 1 state in common except with pyridine. Cr⁺² has few stable salts like CrCl₂, CrSO₄ while Cr⁺³ forms very stable salts like CrCl₃. Cr⁺⁴ and Cr⁺⁵ are unstable oxidation states. Cr⁺⁶ is the most stable state due to inert gas [Ar] electronic configuration and form the salts like K₂Cr₂O₇.

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