Question

17. Common salt is a mixture of

• A. Sodium chloride and magnesium chloride
• B. Sodium Chloride and iodine
• C. Sodium Chloride , Iodine and potassium iodide
• D. Sodium Chloride , sodium iodide and potassium iodide

Answer 1

The correct option is D

Sodium Chloride , sodium iodide and potassium iodide

Explanation:

Option (D):

Common salt is a mixture of sodium chloride $\left(\mathrm{NaCl}\right)$, Sodium Iodide$\left(\mathrm{NaI}\right)$, and Potassium Iodide $\left(\mathrm{KI}\right)$, because Iodized salt is also added along with Sodium chloride as it helps in the prevention of thyroid gland-related diseases like goiter(abnormal enlargement of the thyroid gland). Thus Iodized salt is made up of a mixture of sodium iodide $\left(\mathrm{NaI}\right)$ and potassium iodide $\left(\mathrm{KI}\right)$. Hence

Common Salt = Sodium Chloride + Iodized salt ( Sodium iodide + Potassium Iodide)

$\left(\mathrm{NaCl}\right)$ $\left(\mathrm{NaI}\right)$ $\left(\mathrm{KI}\right)$