From the knowledge of activity series, name a metal which shows the following properties:

(i) It reacts readily with cold water

(ii) It displaces hydrogen from hot water

(iii) It displaces hydrogen from dilute HCl

(iv) It forms a base which is insoluble in water.

Complete the following word equations:

(a) Sodium hydroxide + zinc ⟶ hydrogen + ……………

(b) Calcium + water ⟶ calcium hydroxide + ……………

For laboratory preparation of hydrogen, give the following

(a) materials used

(b) method of collection

(c) chemical equation

(d) fully labelled diagram.

(a) Name the impurities present in hydrogen prepared in the laboratory.

(b) How can these impurities be removed?