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ICSE Class 10 Chemistry Question 9 of 19

Solved 2017 Question Paper ICSE Class 10 Chemistry — Question 6

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6
Question

Question 3(b)

State the observations at the anode and at the cathode during the electrolysis of :

(i) fused lead bromide using graphite electrodes.

(ii) copper sulphate solution using copper electrodes.

Answer

(i) The observations at the anode & at the cathode are:
At cathode — silvery grey deposit of lead metal.
At anode — reddish brown fumes of bromine vapours.

(ii) The observations at the anode & at the cathode are:
At cathode — Brownish pink copper metal is deposited at cathode during electrolysis of copper sulphate.
At anode — Copper ions are formed. Copper anode diminishes in mass.

Blue colour of CuSO4 remains unchanged.