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How many of the following electrodes can...

How many of the following electrodes can reduce HCl to `H_(2)`?
`Cu^(2+)+2e^(-)toCu(+0.34V)`
`Fe^(2+)+2e^(-)toFe(-0.44V)`
`Ni^(2+)+2e^(-)toNi+0.25V)`
`Sn^(2+)+2e^(-)toSn(-0.14V)`
`Fe^(3+)+e^(-)toFe^(2+)(+0.77V)`

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Verified by Experts

The correct Answer is:
2
The standard potential of hydrogen electrode is zero. Hence any species having electrode potential less than zero can reduce `HCl` to `H_(2)`
`Fe^(2+)+2e^(-)toFe(-0.44V),` and
`Sn^(2+)+2e^(-)toSn(-0.14V)` can reduce `HCl` to `H_(2)`
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