O-LevelChemistryMetals & Reactivity5070/22 · Oct/Nov 2021 · Q55 Marks
Lithium reacts with aqueous zinc iodide. 2Li + ZnI2 → 2LiI + Zn
- (a)Explain, by referring to the equation, why this reaction involves both oxidation and reduction.[2]
- (b)Acidified aqueous silver nitrate is added to aqueous zinc iodide. State the observations made.[1]
- (c)(i)When aqueous bromine reacts with aqueous zinc iodide a brown solution is formed. Name the products of this reaction. and[1]
- (c)(ii)Explain why aqueous bromine does not react with aqueous zinc chloride.[1]
Mark scheme
Marking points from the official mark scheme (Oct/Nov 2021). The mark or mark type is shown in brackets.
- [2] lithium oxidised because it loses electrons (1)
- zinc ions reduced because they gain electrons (1)
- [1] yellow precipitate / yellow solid
- [1] iodine AND zinc bromide
- [1] chlorine is more reactive than bromine / bromine is less reactive than chlorine
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