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A black compound (A) is solid state is fused with KOH with `KClO_3`.The aqueous extract of fused mass is green colour solution (B).On passing `CO_2` gas through it pink colour of ( C) is noticed along with some black insoluble mass of (A).The pink coloured solution is decolourised by `Fe^(2+)` in acidic medium.What is oxidation state of central metal in ( C). |
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Answer» Correct Answer - 7 `underset((A))(3MnO_2)+6KOH+KCIO_3oversetDeltatounderset((B))(3K_2MnO_4)+KCl+3H_2O` In presence of `CO_2`, the medium becomes acidic. `3MnO_4^(2-)+4H^(+)toMnO_2 + 2MnO_4^(-)+2H_2O` `underset((C ))(MnO_4^-)+5Fe^(2+)+8H^(+)toMn^(2+)+5Fe^(3+)+4H_2O` |
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