(a)[2]
Explain, in terms of bond breaking and bond forming, why this reaction is exothermic.
(b(i))[1]
A brown solution is seen when chlorine is added to aqueous potassium iodide. Name the products formed in this reaction.
(b(ii))[1]
Bromine water is added to potassium chloride, but no change occurs. Explain why no reaction takes place.
(c)[1]
Phosphorus(III) chloride reacts with water to give phosphorous acid, $\text{H}_3\text{PO}_3$, together with hydrochloric acid. Write the equation for this reaction.