During the reaction of some metals with dilute hydrochloric acid, following observation were made. Explain this observation giving suitable reasons.

 Silver metal does not show any change.

During the reaction of some metals with dilute hydrochloric acid, following observation were made. Explain this observation giving suitable reasons.

The temperature of the reaction mixture rises when aluminium $\left(\mathrm{Al}\right)$ is added.

During the reaction of some metals with dilute hydrochloric acid, following observation were made. Explain this observation giving suitable reasons.

The reaction of sodium metal is found to be highly explosive

During the reaction of some metals with dilute hydrochloric acid, the following observation was made. Explain this observation giving suitable reasons.

Some bubbles of a gas are seen when lead $\left(\mathrm{Pb}\right)$ is reacted with the acid.

Write a balanced chemical equation for each of the following reactions and also classify them.

Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

Write a balanced chemical equation for each of the following reactions and also classify them.

A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

Write a balanced chemical equation for the following reaction and also classify it.

Iron $\left(\mathrm{III}\right)$ oxide on heating with Carbon monoxide gas reacts to form solid Iron and liberates Carbon dioxide gas.

Write a balanced chemical equation for the following reaction and classify it.

Hydrogen sulphide gas reacts with Oxygen gas to form solid Sulphur and liquid water.