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.

Answer»

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

Solution :Al displaces H from HCL but SILVER cannot it means Al is situated above the AG in ECS, HENCE Al will acts as anode and Ag will act as cathode.
`E_(cell)^(o)=E_("cathode")^(o)-E_("anode")^(o)=E_(Ag^(+)//Ag)^(o)-E_(Al^(3+)//Al)^(o)`
`2.46=0.8-E_(Al^(3+)//Al)^(o),E_(Al)^(o)=0.8-2.46=-1.66V`.


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