Q3 An unknown green solution is heated with a piece of aluminum foil and sodium hydroxide solution.

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


Its ammonia gas


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


The anion is nitrate ion (NO3 -)


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