Question 3: An unknown green solution is heated with a piece of aluminium foil and sodium hydroxide solution.

(i) The gas produced turns damp red litmus paper blue. Name the gas evolved.

(ii) This is a confirmatory test for an anion. Name this anion.

(iii) Give a possible cation which gives the green solution.

(i) Ammonia gas

(ii) Nitrates

(iii) Iron (II) ion