1.

The potential of the cell for the reaction M(s)+2H^(+)(1M)rarrH_(2)(g)(1"atm")+M^(2+)(0.1M)is 1.500V the standard reduction potential for M^(2+)//M couple is

Answer»

0.1470V
1.470V
`-1.47V`
NONE of these

Solution :The cell is
`M|M^(2+)(0.1M)||H^(+)(M)|H^(+)(M)|H _(2)(1"atm")`
`E_("cell")=E_("cell")^(@)-(0.0591)/(2)"log"[M^(2+)]`
`1.5=E_("cell")^(@)-(0.0591)/(2)"log"(0.1)`
`1.5=E_("cell")^(@)+0.02955`
or `E_("cell")^(@)=E_(2H^(+)//H_(2))^(@)-E_(M^(2+)//M)^(@)`
`therefore 1.47=0-E_(M^(2+)//M)^(@)`
or `E_(M^(2+)//M)^(@)=-1.47V`.


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