1.

E_("red")^(0) (Standard reduction potential ) of different half-cells are given E_(Cu^(+2)//Cu)^(0) = 0.34 VE_(Zn^(+2)//Zn)^(0)= -0.76 V , E_(Ag^(+) // Ag)^(0) = 0.80 V , E_(Mg^(2+) // Mg)^(0) = -2.37 V . In which cell DeltaG^(@) is most negative ?

Answer»

`Zn// Zn ^(2+) (1M)// // MG^(2+) (1M)// Mg `
`Zn//Zn^(2+) (1M)// // Ag^(+) (1M)// Ag `
`Cu// Cu^(2+) (1M)// Ag^(+) (1M)// Ag `
`Ag// Ag^(+) (1M) // Mg^(+2) (1M)// Mg `

Solution :`DeltaG^(0) = -ve implies E_("cell")^(0) = +ve`
a ) WRONG` (E_("cell")^(0) -ve)` b)` E_("cell")^(0) = 0.80 + 0.76 = 1.56V`
C) `E_("cell")^(0) = 0.80 - 0.34 = 0.46 V ` d) wrong ` (E_("cell")^(0) =-ve )`


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