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Q.

To convert the standard Galvanic cell  Mg/Mg2+//Al3+/Al   into an electrolytic cell, the minimum opposite external potential to be applied is ____________ V

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answer is 2.

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Detailed Solution

Greater than 0.71V. The applied opposite external potential should be little above the cell emf. ECathode(Al,Al3+)−EAnode(Mg,Mg2+)=−1.66−(−2.37)=0.71V
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