## Chemistry: The Central Science (13th Edition)

$H_{2}O_{2} < I^{-} < Sn^{2+} < Zn < Al$
Reducing strengths of each are given below: $Zn: -0.763$ $I^{-}: +0.536$ $Sn^{2+}: -0.136$ $H_{2}O_{2}: +1.776$ $Al: -1.66$