CBSE Class 10 Science 2019 Delhi Set 1

Question : 7

Total: 28

Identify the acid and the base from which sodium chloride is obtained. Which type of salt is it? When is it called rock salt? How is rock salt formed?

Solution:

NaCl is made by reacting an acid and a base. The base is NaOH (Sodium hydroxide). So,
HCl+NaOH→NaCl+H2O
It is a Neutralisation Reaction.
It is known as rock salt in crystalline form.
It is the result of the evaporation of ancient oceans millions of years ago. Sometimes pressure from deep inside the earth forces up large masses of rocks to from salt like domes.

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