'Magnesium reacts with very dilute nitric acid at low temperatures liberating hydrogen.' Give reasons.

State the conditions and give balanced equations for the conversion of –

(a) coke to water gas,

(b) water gas to hydrogen

in the Bosch process.

Compare the combustibility of –

(a) pure hydrogen

(b) hydrogen-air mixture.

State the reactant added to hydrogen to obtain the respective product in each case.

(a) Ammonia

(b) Hydrogen chloride

(c) Water

(d) Hydrogen sulphide