A substance 'A' was heated with slaked lime and a gas 'B' with a pungent smell was obtained. Name the substances A and B and give a balanced equation.

Ammonia is manufactured by Haber's process —

(a) Under what conditions do the reactants combine to form ammonia? Give a balanced equation for the reaction.

(b) In what ratio by volume, are the above gases used?

(c) State one possible source of each reactant used in Haber Process.

(d) State whether the formation of ammonia is promoted by the use of high pressure or low pressure?

(e) Mention two possible ways by which ammonia produced is removed from unchanged gases.

(f) What is the function of

    (i) finely divided iron,

    (ii) molybdenum

in the above process?

(g) What is the percentage formation of ammonia?

(h) How can this percentage formation be increased?

Give reason —

Ammonium nitrate is not used in the preparation of ammonia.

Give reason —

Conc. H₂SO₄ is a good drying agent, yet it is not used to dry NH₃.