(a) Of the two gases, ammonia and hydrogen chloride, which is more dense? Name the method of collection of this gas.

(b) Give one example of a reaction between the above two gases which produces a solid compound.

(c) Write a balanced equation for a reaction in which ammonia is oxidized by:

(i) a metal oxide

(ii) a gas which is not oxygen.

(a) Which feature of ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water?

(b) Name the other ion formed when ammonia dissolves in water.

(c) Give one test that can be used to detect the presence of the ion produced in (b).

(a) Ammonia reacts with excess chorine to form …………… (nitrogen / nitrogen trichloride / ammonium chloride).

(b) Give a balanced equation: Ammonium hydroxide is added to ferrous sulphate solution.

(c) Write observations: Ammonia gas is passed over heated copper (II) oxide.

Name the gas evolved in each case [formula is not acceptable]. The gas that burns in oxygen with a green flame.