1.

Predict the products of electrolysis obtained at the electrodes in each case when the electrodes used are of platinum : (i) An aqueous solution of AgNO_3. (ii) An aqueous solution of H_2SO_4.

Answer»

Solution :(i) `AgNO_(3)(aq) to Ag^(+) (aq) + NO_(3)^(-) (aq)`
`H_(2)O (l) to H^(+) (aq) + OH^(-) (aq)`
At cathode: `Ag^(+) (aq) + E^(-) to O_(2) + 2H^(+) (aq) +4e^(-)`
`H_(2)O(l) to H^(+) (aq) + OH^(-) (aq)`
At cathode: `2H^(+) (aq) + 2e^(-) to O_(2) + 2H^(+) (aq) + 4e^(-)`
or `2H_(2)O (l) to O_(2) + 4H^(+) (aq) + 4e^(-)`
Hydrogen gas is produced at the cathode and oxygen at the anode.


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