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Which half-reaction correctly represents reduction? (1) Mn4+ ==> Mn3+ + e- (2) Mn4+ ==>Mn7+ + 3e- (3) Mn4+ + e- ==>Mn3+ (4) Mn4+ + 3e- ==> Mn7+
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Which half-reaction correctly represents reduction?

(1) Mn4+ ==> Mn3+ + e-
(2) Mn4+ ==>Mn7+ + 3e-
(3) Mn4+ + e- ==>Mn3+
(4) Mn4+ + 3e- ==> Mn7+

User John Kroetch
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The answer is (3) Mn4+ + e- ==> Mn3+. In the reduction reaction, the element can gain electrons and the valence of this element will decrease. Oxidation is opposite to the reduction.
User Shivang
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