1.

Aluminium displaces hydrogen from dilute HCl whereas silver does not. The e.m.f. of a cell prepared by combining Al//Al^(3+) and Ag//Ag^(+) is 2.46V. The reduction potential of silver electrode is +0.80V. The reduction potential of aluminium electrode is

Answer»

`+1.66V`
`-3.26V`
`3.26V`
`-1.66V`

Solution :AL is more reactive than AG, i.e., CELL reaction is
`Al+3Ag^(+) to Al^(3+)+3Ag`
`E_(cell)=E_("cathode")^(@)-E_("anode")^(@)`
`=E_(Ag^(+)//Ag)^(@)-E_(Al^(3+)//Al)^(@)`
`2.46=0.80-E_(Al^(3+)//Al)^(@)`
or `E_(Al^(3+)//Al)^(@)=-1.66V`


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