Which gas is liberated when dilute hydrochloric acid reacts with sodium carbonate? How will you test for the presence of this gas?

What happens when an acid reacts with a base?

Explain by taking the example of hydrochloric acid and sodium hydroxide.

Give the equation of the chemical reaction which takes place.

What is the special name of such a reaction?

What happens when an acid reacts with a metal oxide?

Explain with the help of an example. Write a balanced equation for the reaction involved.

What is meant by strong acids and weak acids?

Classify the following into strong acids and weak acids:
$\mathrm{H}\mathrm{C}\mathrm{l}, \mathrm{C}{\mathrm{H}}_3\mathrm{C}\mathrm{O}\mathrm{O}\mathrm{H}, {\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_4, \mathrm{H}\mathrm{N}{\mathrm{O}}_3, {\mathrm{H}}_2\mathrm{C}{\mathrm{O}}_3, {\mathrm{H}}_2\mathrm{S}{\mathrm{O}}_3$

What is a neutralisation reaction? Explain with an example.

Give the chemical equation of the reaction which takes place.