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For the cell Zn(s) |Zn 2+ (aq)| |M x+ (aq)| M(s), different half cells and their standard electrode potentials are given below : M X+ (aq)/M(s) Au 3+ (aq)/Au(s) Ag + (aq)/Ag(s) Fe 3+ (aq)/Fe 2+ (aq) Fe 2+ (aq)/Fe(s) 0 M / M x E + /(V) 1.40 0.80 0.77 –0.44 If 0 Zn / Zn 2 E + = –0.76 V, which cathode will give maximum value of 0 cell E per electron transferred?

1. Ag + /Ag
2. Fe 3+ /Fe 2+
3. Au 3+ /Au
4. Fe 2+ /Fe

Correct answer: Ag + /Ag

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