A black compound (A) in solid state is fused with KOH and KClO3. The aqueous extract of fused mass is green color solution (B). On passing CO2 gas through it, pink color of (C) is noticed along with some black insoluble mass of (A). The pink colored solution is decolorized by Fe2+ in acidic medium. What is the oxidation state of central metal in (C)?

A black compound (A) in solid state is fused with KOH and KClO3. The a

1.	A black compound (A) in solid state is fused with KOH and KClO3. The aqueous extract of fused mass is green color solution (B). On passing CO2 gas through it, pink color of (C) is noticed along with some black insoluble mass of (A). The pink colored solution is decolorized by Fe2+ in acidic medium. What is the oxidation state of central metal in (C)?
Answer» A black compound $(A)$ in solid state is fused with $K O H$ and $K C l O_{3}$ . The aqueous extract of fused mass is green color solution $(B)$ . On passing $C O_{2}$ gas through it, pink color of $(C)$ is noticed along with some black insoluble mass of $(A)$ . The pink colored solution is decolorized by $F e^{2 +}$ in acidic medium. What is the oxidation state of central metal in $(C)$ ?