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Question

Refer to the following experimental data.

Half ReactionEo
I. MgMg2++2e2.37V
II. MnMn2++2e1.03V
III. H22H++2e0.00V
IV. CuCu2++2e-0.16V
What will be the standard reduction potential for the reaction: Mg+Mn2+Mg2++Mn?

A
-0.16V
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B
-1.34V
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C
1.03V
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D
1.34V
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Solution

The correct option is D 1.34V
Eocell=EoCEoA
EoMg2+/Mg=2.37V (more ve reduction potential)
EoMn2+/Mn=1.03V (less ve reduction potential)
Eocell=10.3(2.37)=1.34V

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