(i) Under what conditions iron reacts with water?

(ii) Give the balanced equation of the reaction.

(iii) What is noticed if the products are not allowed to escape?

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.

Hydrogen is evolved by the action of cold dil. HNO₃ on

1. Fe
2. Cu
3. Mg
4. Zn

Which metal produces hydrogen gas on reaction with cold water?

1. Al
2. Fe
3. Pd
4. Na