1.

For a calomel electrode , which of the following is 'FALSE' statement ?

Answer»

it is a secondary REFERENCE electrode
the potential of calomel electrode is fixed on Hydrogen scale
STANDARD OXIDATION VALUE of potential is independent on concentration of KCl solution
it is reversible with respect to CHLORIDE ions

Solution :`Zn_((s)) + 2 Ag_((aq)) ^(+) to 2 Ag_((s)) + Zn_((aq))^(2+)`
The two half cell reactions are
`Zn(s) to Zn_((aq))^(2+) + 2e^(-)`
`[Ag_((aq))^(+) + e^(-) to Ag (s)] xx 2`
Therefore , Zn is oxidised and act as negative electrode (anode ) whereas , `Ag^(+)` ions are reduced and acts as positive electrode (cathode)
Hence the cell representation is
`Zn | Zn^(2+) | | Ag^(+) |Ag`


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