Question

Acidified water is electrolysed using platinum electrodes.
For the above electrolysis reaction, answer the following:
1. Write the reaction at the cathode.
2. Write the reaction at the cathode.
3. Observation at the cathode.
4. Observation at the anode.

Answer 1

Explanation:

(i) At the anode oxidation reaction takes place.

At anode : Cu−2e

−

→Cu

2+

At cathode redution reaction occurs.

At cathode : Cu

2+

+2e

−

→Cu

Here both copper electrodes are used.

(ii) At anode : Br

−

−e

−

→Br

Br+Br→Br

2

At cathode : Pb

2+

+2e

−

→Pb

Here both anode and cathode are made up of graphite as it is unaffected by bromine vapours

Answer 2

Answer:

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