1.

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

Answer»

`+3.04`VOLTS
`-3.04` volts
`+2.36` volts
`-2.36` volts

Solution :Mg lies above Cu in electrochemical series and hence Cu ELECTRODE acts as CATHODE.
`E_(CELL)^(o)=E_(Cu^(++)//Cu)^(o)-E_(Mg^(++)//Mg)^(o)=-2.36V`


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