During the reaction of some metals with dilute hydrochloric acid, following observations were made.
- The temperature of the reaction mixture rises when aluminium (Al) is added.
- The reaction of sodium metal is found to be highly explosive.
- Some bubbles of a gas are seen when lead (Pb) is reacted with the acid.
Explain these observations giving suitable reasons.
Answer:
- The temperature of the reaction mixture rises when aluminium is added because it is an exothermic reaction.
- Reaction of sodium metal is found to be highly explosive because it is an exothermic reaction.
- When lead is treated with hydrochloric acid, bubbles of hydrogen gas are evolved.