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Question

Which of these half-reactions represents an oxidation?
I. Sn4+Sn2+
II. MnO4Mn2+
III. Cl2ClO3

A
I only
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B
II only
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C
III only
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D
I and II only
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E
II and III only
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Solution

The correct option is C III only
Oxidation state of Sn changes from +4 to +2
Oxidation state of Mn changes from +7 to +2
Oxidation state of Cl changes from 0 to +7

Therefore reaction III represents oxidation.

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