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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

+ 2.36 volts

c

– 3.04 volts

d

– 2.36 volts

answer is D.

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Detailed Solution

Mg lies above Cu in electrochemical series and hence Cu electrode acts as cathode.

Ecello= Ecathodeo- Eanodeo  2.7  = 0.34 - EMg2+/Mgo EMg2+/Mg o= -2.36V 

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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