Chemistry 0620 · IGCSE · Electrolysis

Electrolysis — practice question

This question concerns lead(II) chloride, $\text{PbCl}_2$.
(a(i))[2]

Identify two soluble salts that can be mixed to make lead(II) chloride.

(a(ii))[3]

Write the ionic equation for the reaction that forms lead(II) chloride when aqueous solutions are mixed. Include state symbols.

(a(iii))[3]

List the steps the student should follow to obtain a pure sample of lead(II) chloride from the mixture in the beaker.

(b(i))[1]

Explain why lead(II) chloride has to be molten before it can conduct electricity.

(b(ii))[2]

Write the ionic half-equation for the reaction taking place at the anode.

(b(iii))[2]

State the test for chlorine gas and the observations.

(b(iv))[1]

Describe what is observed at the cathode.

Worked solution & mark scheme

This 14-mark question has a full step-by-step worked solution and mark scheme. One marking point: Lead(II) nitrate

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