1.

The standard oxidation potentials of Zn, Cu, Ag and Ni electrodes are +0.76,-0.34,-0.80 and +0.25 V respectively . Which of the following reaction will provide maximum voltage ?

Answer»

`CU+2Ag^(+)(aq)toCu^(2+)(aq)+2Ag`
`Zn+2AG^(+)(aq)toZn^(2+)(aq)+2Ag`
`H_(2)+NI^(2+)(aq)to2H^(+)(aq)+Ni`
`Zn+Cu^(2+)(aq)toZn^(2+)(aq)+Cu`

Solution :For (a) `E^(@)=-0.34+0.80=0.46V`
(b)`E^(@)=0.76+0.80=1.56V`
(C ) `E^(@)=-0.25V`
(d)`E^(@)=0.76+.34=1.00V`
(e )`E^(@)=0.76V`
`therefore` Correct ANSWER (B) .


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