How do you know the nature of salt formed due to the reaction between acids and bases?

How do you know the valence of a metal?

How do you know the valence of a non-metal?

How do you know the percolation rate of soil?

Do you know what 'soap' is?

What is the nature of the salt CaSO_4 formed by the reaction between calcium hydroxide and sulphuric acid?

Write the formulae of the following salts Ammonium chloride Identify the acids and bases for which the above salts are obtained also write chemical equations for the reactions between such acids and bases which type of chemical reactions they are.

How do you think they are formed there?

How do you decide the strength of acid or base ?

Do you know how metals are obtained ?

Do you know what is a catalyst ?