Answer
$Sn^{2+} (aq) → Sn^{4+} (aq) + 2e^{-}$
Here Sn goes from 2+ to 4+ state while releasing two electrons, hence it is oxidation reaction.
Work Step by Step
Given above
Chemistry: The Central Science (13th Edition)
by Brown, Theodore E.; LeMay, H. Eugene; Bursten, Bruce E.; Murphy, Catherine; Woodward, Patrick; Stoltzfus, Matthew E.
Published by
Prentice Hall
ISBN 10:
0321910419
ISBN 13:
978-0-32191-041-7
Chapter 20 - Electrochemistry - Exercises - Page 901: 20.23a
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