Q3 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.
The gas is Ammonia.
(ii) This is a confirmatory test for an anion. Name this anion.
The anion is Nitrate.
(iii) Give a possible cation which gives the green solution.
Iron ll.