Question

The halide ore of sodium is called as _____.
A. Horn salt
B. Cryolite
C. Rock salt
D. Both (A) and (C)

Answer 1

Hint: The most common halide ore of sodium is sodium chloride, also known as common salt. The molecular formula of common salt is NaCl. It is the major salt responsible for the salinity of seawater.

Complete step by step answer:
The most common halide ore of sodium is sodium chloride. It is also known as common salt. It is an ionic compound with the chemical formula NaCl, with a 1:1 ratio of sodium and chloride ions. The molar mass of sodium chloride is 58.5 gram per moles. Sodium chloride is the salt most responsible for the salinity of seawater and of the extracellular fluid of many multicellular organisms. It is known as table salt in edible form. It is also used as a condiment and as a food preservative. Large quantities of sodium chloride are used in many industrial processes, and it is a major source of sodium and chlorine compounds used as feedstocks for further chemical synthesis. It is also used in de – icing of roadways in sub – freezing weather.
The other name for the halide ore of sodium, i.e. sodium chloride is rock salt. NaCl is known as rock salt because the mineral from which it is obtained, called halite is also known as rock salt. This mineral derives its name from the fact that when sediments containing these minerals dry up, they form masses of rock.
Hence, the correct answer is (C).

Note: Remember that NaCl is obtained from the mineral halite. Halite is also known as rock salt, thus NaCl obtained from it is also called rock salt.