1.

Given E^(@) values as: Ni^(2+)//Ni=0.25V,Cu^(2+)//Cu=0.34V,Ag^(+)//Ag=0.80V and Zn^(2+)//Zn=-0.76V Which of the following reactions under standard conditions will not take place in the specified directions?

Answer»

`Ni^(2+)(aq)+Cu(s)toNi(s)+Cu^(2+)(aq)`
`Cu(s)+2Ag^(+)(aq)TOCU^(2+)(aq)+2Ag(s)`
`Cu(s)+2H^(+)(aq)toCu^(2+)(aq)+H_(2)(G)`
`Zn(s)+2H^(+)(aq)toZn^(2+)(aq)+H_(2)(g)`

Solution :Cell REACTION is spontaneous if its emf is +ve.


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