1.

Exalain: Reduction reaction is possible with higher E^(Theta) value. OR Reduction of water is carried out near cathode in presence of aqueous Na. OR Reduction of species is dependent on its reduction potential value.

Answer»

Solution :* Reduction reactions OCCUR on the surface of CATHODE. If more than one species are present near cathode, in such situations, species with higher `E^(Theta)` value gives reduction reactions.
* e.g., If we take an example of aqueous NaCl solution, DUE to aqueous solution, near cathode `Na^(+)` ions of NaCl and `H^(+)` ions of `H_(2)O` are available.
`NaCl to Na^(+)("Cation")+Cl^(-)("Anion")`
`H_(2)O_((l)) to H^(+)("Cation")+OH^(-)("Anion")`
(i) `Na_((aq))^(+) +e^(-) to Na_((S))""E_(cell)^(Theta)=-2.71V`
(ii) `H_((aq))^(+)+e^(-) to (1)/(2)H_(2(g))""E_(cell)^(Theta)=0.00V`
* So, reaction


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