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Question

Half ReactionEo
I. MgMg2++2e2.37V
II. MnMn2++2e1.03V
III. H22H++2e0.00V
IV. CuCu2++2e-0.16V
From the above experimental data which of the following represents a spontaneous process?

A
Mn2++H2
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B
Mg+Mn2+
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C
Mg2++Mn
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D
Cu+2H+
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E
Mg2++Cu
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Solution

The correct option is D Mg+Mn2+
E0A=(0.001.03)=1.03 V
E0B=(2.371.03)=1.34 V
E0C=(1.032.37)=1.34 V
E0D=(0.160.00)=0.16 V
E0E=(0.162.37)=2.53 V

Reaction is feasible if E0 is positive. Therefore, only reaction B is possible.

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