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The standard reduction potentials of two...

The standard reduction potentials of two half cells `Al^(3+) (aq) | Al`and `Mg^(2+)(aq) | Mg` are -1.66V and -2.36V respectively. Calculate the standard cell potential. Write the cell reactions also.

Text Solution

Verified by Experts

The correct Answer is:
`0.70V,3Mg+2Al^(3+)to3Mg^(2+)+2Al`
E.M.F. can be positive only if oxidation takes place at Mg-electrode, i.e., the cell reaction is:
`3mg+2Al^(3+)to3Mg^(2+)+Al`
`E_(cell)^(@)=E_(Al^(3+)//Al)^(@)-E_(Mg^(2+)//Mg)^(@)=-1.66-(-2.36)V=0.70V`.
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Knowledge Check

  • The standard reduction potential of Cu^(2+)//Cu and Cu^(2+)//Cu^(+) are 0.339 V and 0.153 V respectively. The standard electrode potential of Cu^(+)//Cu half cell is :

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    D
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