Q.

A cell constructed by coupling a standard copper electrode and a standard magnesium electrode has emf of 2.7 volts. If the standard reduction potential of copper electrode is +0.34 volt, that of magnesium electrode is

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answer is 4.

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Detailed Solution

since EMF of cell is positive reaction is spontaneous. This is possible only if SRP of cathode is greater than SRP of anode.Ecell0=ECu+2|Cu0-EMg+2|Mg0 2.7=0.34-EMg+2|Mg0 EMg+2|Mg =0.34-2.7=-2.36 V
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