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Relative Reduction Potential Assuming standard conditions, and considering the table of standard reduction potentials for half-reactions,...

Relative Reduction Potential Assuming standard conditions, and considering the table of standard reduction potentials for half-reactions, given in your text, rank the following species according to their relative strength as reducing agents. For example, the most powerful reducing agent would be given rank "1", and the least "6".

Pb2+ (acidic half-cell solution)
H2O2 (acidic half-cell solution)
Cr3+ (acidic half-cell solution)
Ba
Sn
Al


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Answer #1

Pb2+ (acidic half-cell solution)

Pb2+ + 2H2O -----> PbO2 + 4H+ + 2e-

Eo = -1.46 V [3]

H2O2 (acidic half-cell solution)

H2O2+2H++2e− --- > 2H2O  

E°= 1.534 V [6]

Cr3+ (acidic half-cell solution)

Cr2O7^2- (aq) +14H+ (aq) + 6 e- --- > 2Cr3+   + 7H2O (l)   E°= +1.33 V [5]


Ba

Ba 2+ (aq)   2e- --- > Ba(s)

E°= -2.90 V [1]

Sn

Sn 2+ (aq)   2e- --- > Sn (s)

E°= - 0.14 V [4]

Al

Al3 + (aq)   3e-    --- > Al (s)

E°= -1.66 V [2]

The compound which have lowest standard reduction potential show strongest reducing property thus here Ba has lowest value thus it is most reducing agent .

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