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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03-06-2015
Chemistry

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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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Lulu1991idn Lulu1991idn · Answer 1 · 2015-06-03T17:21:24-04:00

Lulu1991idn Lulu1991idn

03-06-2015

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.

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