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The oxidation ptentials of Zn, Cu, Ag, H...

The oxidation ptentials of `Zn, Cu, Ag, H_2` and Ni are `0.76, - 34, - 0.80 . 0. 00, 0. 25` volt, respectively. Which of the following reactions will provide maximum voltage ?

A

`Zn+Cu^(2+) rarr Cu+Zn^(2+)`

B

`Zn+2Ag^+ rarr 2 Ag+Zn^(2+)`

C

` H_2+Cu^(2+) rarr 2H^+ +Cu`

D

` H_2+Ni^(+2) rarr 2H^+ +Ni`

Text Solution

Verified by Experts

The correct Answer is:
B
`E_("cell")^@=0.8 (-0.767) =1.56V`
Maximum voltafe is produced when electode having minimum oxidation potential is made cathode and maximum oxidation potential is made anode.
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