Answer:
(i) Conversion of
pyrolusite ore into potassiummanganate. Ore is fused with K2CO3
or KOH in the presence of oxidising agent KNO3 or KCIO3
to get K2MnIO4.
(ii)Conversion of
potassium managanate to potassium permanganate.
Potassium manganate
solution is electrolysed in a tank having nickel anode and iron cathode.
Manganate ion is oxidised to give permanganate ion.
At cathode: H+
+ e?H
H + H H2O
At anode:
Reactions:
(a) Iron (II) ions
MnO4?
+ 5Fe2+ + 8H+
Mn2+ + 5Fe3+ + 4H2O
(b) SO2
2MnO4?
+ 5SO2 + 2H2O 2Mn2+
+
+4H+
(c) Oxalic acid
+ 10CO2
+ 8H2O
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