Chemistry 5070 · O Level · Reversible reactions and equilibrium

Reversible reactions and equilibrium — practice question

Lead is a metal belonging to Group IV of the Periodic Table.
(a)[2]

An ion of lead is represented by $^{207}_{82}\text{Pb}^{2+}$. Deduce the number of electrons and neutrons in this ion.

(b(i))[2]

Lead(IV) oxide, $\text{PbO}_2$, is an oxidising agent. Describe a test used for oxidising agents. test ……… observations ………

(b(ii))[1]

When lead(IV) oxide reacts with concentrated hydrochloric acid, the products are lead(IV) chloride, $\text{PbCl}_4$, and water. Construct the equation for this reaction.

(c(i))[2]

When lead(IV) chloride is warmed in a closed container an equilibrium mixture is established. $\text{PbCl}_4(\ell) \rightleftharpoons \text{PbCl}_2(\text{s}) + \text{Cl}_2(\text{g})$ Describe and explain the effect, if any, on the position of equilibrium when the concentration of chlorine is increased.

(c(ii))[2]

Describe and explain the effect, if any, on the position of equilibrium when the temperature is raised.

(d)[1]

Name a lead salt which dissolves in water.

Worked solution & mark scheme

This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: number of electrons = 80

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