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.
 (ii) This is a confirmatory test for an anion. Name this anion.
(iii) Give a possible cation which gives the green solution.
Answers
i) ammonia
ii)Nitrate
iii)iron(III)