Selective Oxidation The standard reduction potential for the half-reaction is +0

Question

Selective Oxidation

The standard reduction potential for the half-reaction

is +0.15 V.  
Consider data from the table of standard reduction potentials for common half-reactions, in your text.
For a galvanic cell under standard conditions, which of the following cathodic half reactions would produce, at the anode, a spontaneous oxidation of Sn to Sn2+ but not Sn2+ to Sn4+.

Sn4+ + 2e- Sn2+ The standard reduction potential for the haIf-reaction: Sn^4+ 2e^- rightarrow Sn^2+ is +0.15 V. Consider data from the table of standard reduction potentials for common half-reactions, in your text. For a galvanic cell under standard conditions, which of the following cathodic half reactions would produce, at the anode, a spontaneous oxidation of Sn^2+ but not Sn^2+ to Sn^4+.

Explanation / Answer

Sn2+ -----> Sn4+ + 2e- , Eo = -0.15 V

Sn -----> Sn2+ + 2e-, , Eo = +0.1375 V

For the Sn to Sn2+ but not Sn2+ to Sn4+, -0.1375 V < E0(reduction) < +0.15 V

2H2O + 2e- -----------> H2 + 2OH- (NO)

Fe2+ + 2e- ----> Fe, Eo = -0.44 V (NO)

Sn4+ + 2e- ----> Sn2+, Eo = -0.15 V (NO)

Pb2+ + 2e- ----> Pb, Eo = -0.126 V (YES)

2H+ + 2e ----------> H2 Eo = 0 (YES)

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