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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a

+ 3.04 volts

b

– 3.04 volts

c

+ 2.36 volts

d

– 2.36 volts

answer is D.

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Detailed Solution

Since EMF of cell is +ve. SRP of Anode must be less than SRP of cathode.SRP of Mg electrode is less than that of Cu electrode.Ecell=Eco-Eao=ECu+2/Cuo-EMg+2/Mgo2.7=0.34-EMg+2/MgoEMg+2/Mgo=-2.36V
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