The standard reduction potentials for the following reactions are: Fe3++3e−→Fe with E∘=−0.036V Fe2++2e−→Fe with E∘=−0.44V What would be the standard electrode potential for the reaction Fe3++e−→Fe2+?
A
0.772V
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B
0.077V
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C
−0.404V
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D
−0.772V
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Solution
The correct option is A0.772V Fe3++3e−→FeE∘1=−0.036V(n1=3) Fe→Fe2++2e−––––––––––––––––––––E∘2=+0.44V(n2=2) Fe3++e−→Fe2+E∘3=?(n3=1)