The oxidation reduction reaction between iron metal and aqueous permanganate ion in acidic Solution is
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In acidic medium:
MnO
4
−
+8H
+
+5e
−
→Mn2
+
+4H
2
O
In neutral medium:
MnO
4
−
+2H
2
O+3e
−
→MnO
2
+4OH
−
In basic medium:
MnO
4
−
+H
2
O
→
2MnO
2
+O
2
MnO
4
−
to MnO
2
means Mn from +7 to +4, i.e., 3 electrons are gained.
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