1.

Which reaction shows processing of pyrolusite ore?

Answer»

`2Na_(2)CrO_(4) + H^(+) to Na_(2)Cr_(2)O_(7) + 2Na^(+) + H_(2)O`
`2MnO_(2) + 4KOH + O_(2) to 2K_(2)MnO_(4) + 2H_(2)O`
`MnO_(4) + 8H^(+) + 5Fe^(2+) to 5Fe^(3+) + Mn^(2+) + 4H_(2)O`
`2MnO_(4)^(-) + 5C_(2)O_(4)^(2-) + 16H^(+) to 2Mn^(2+) + 10CO_(2) + 8H_(2)O`

SOLUTION :Pyrolusite ORE, `MnO_(2)` on FUSION with `KOH` in presence of air form potassium manganate, `K_(2)MnO_(4)`.
`2MnO_(2)+4KOH+O_(2)RARR 2K_(2)MnO_(4)+2H_(2)O`


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