Chemistry · May / June 2024 · Paper 11 · Question 19

157.75 g of bismuth(III) chloride, BiCl3, is used to make 500 cm3 of solution using distilled water. The aqueous bismuth(III) chloride slowly becomes cloudy as it reacts with water to form insoluble BiOCl. The reaction is reversible. BiCl3(aq) + H2O(l) ⇌ BiOCl(s) + 2HCl(aq) Which statements are correct? 1 The initial concentration of the bismuth(III) chloride solution is 1.0 mol / dm3. 2 At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. 3 When more hydrochloric acid is added, the position of equilibrium moves to the left. [Ar: Bi, 209; Cl, 35.5]

1. A1, 2 and 3
2. B1 and 2 only
3. C1 and 3 only
4. D2 and 3 only

As printed in the paper