1.

IfE_(Au^(+)// Au)^(@) is 1.69 V andE_(Au^(3+)//Au)^@ is 1.40 V . Then E_(Au^(+)//Au^(3+))^(@) will be :

Answer»

0.19 V
2.945 V
1.255 V
None of these

Solution :(1) `DeltaG_(1)^0) = 1F (1.69) , (2) DeltaG_2^(0)=-3F(1.40) , (3) DeltaG_3^(0) = -2FE_3^(0)`
(1) `Au^(oplus) + 1E^(-) to Au , DeltaG_1 ^(0) , (2) Au^(+3) + 3E^(-) to Au , DeltaG_2^(0)`
(3) `Au^(+3) + 2e^(-) to Au^(+) , DeltaG_(3)^(0) (3)=(2)-(1)`
`DeltaG_(3)^(0) = DeltaG_2^(0) -DeltaG_1^(0) , 2E_3^(0) = (3 xx 1.40) - 1.89 , E_(Au)^(+0//Au^(+3))^(0) = -1.255`


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