Seawater contains many salts dissolved in it. Sodium chloride is separated from these salts. Deposits of solid salt are also found in several parts of the world. These large crystals are often brown due to impurities. This is called rock salt. Deds of rock salt were formed when seas of bygone ages dried up. Rock salt is mined like coal
1. _________ is separated from sea water by evaporating sea water.
(i) Sugar
(ii) Minerals
(iii) Common salt
(iv) None of these
2. Common Salt (sodium chloride) is used in manufacturing of
(i) Soap
(ii) Baking soda
(iii) Caustic soda
(iv) All of these
3. Salt is responsible for regulation of _____in our body.
(i) Water
(ii) Oxygen
(iii) Blood
(iv) Cells
4. True or false. Sodium chloride was an important symbol in our struggle for freedom.
(i) TRUE
(ii) FALSE
