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Electrolysis — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryElectrolysis3 Marks
Question
During the electrolysis of copper (II) sulphate solution using platinum as cathode and carbon an anode:
(i) What do you observe at the cathode and at the anode?
(ii) What change is noticed in the electrolyte?
(iii) Write the reactions at the cathode and at the anode.
✓

Answer

(i) Red shiny metal is deposited at the cathode.
(ii) The colour of the electrolytes changes gradually from blue to colourless.
(iii) At the cathode:
$Cu^{2+}+ 2e^-→ Cu$
Reaction at the anode:
$OH^-→ OH + e^-$
$4OH → 2H_2O + O_2​​​​​​​$​​​​​​​

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