Question

Edible common salt contains:
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine

Answer 1

Hint: When an acid and a base react they tend to form a salt. The nature of salt depends on the compounds and elements which composed the acid and the base. The term salt is a general term to refer to the compounds that are formed after the reaction of the base and the acid. All these salts are generally neutral and have different properties based on the constituent acid and the base.

Complete step by step answer:
Acids and bases react together to form the neutral salts of their respective nature. When acid-containing sodium reacts with the base containing the chloride ion then they react to form the sodium chloride salt. It is the salt that is termed as common salt or edible salt. It can be represented as $NaCl$ .
For commercial use, this common salt is treated with iodine, and therefore the term iodized salt is used for the new entity that is consumed as the common salt. It is because of the high intake of salt by the consumers that iodine addition seemed beneficial.
Salt is treated with an iodine solution or tincture of iodine and then brought to the commercial market. Iodine solution or tincture of iodine is an antiseptic used for medicinal purposes. It is 2-7 $\mathrm{\%}$ elemental iodine, along with potassium iodide or sodium iodide, dissolved in a mixture of water and ethanol. These are characterized by the presence of alcohol

So, the correct answer is Option D.

Note: Iodine being a nonpolar compound is not soluble in polar water. Polar compounds dissolve in polar solvents and vice-versa. Upon dissolution, with water, only $KI$ gives iodide ions for the formation of iodine solution. $NaI$ can also be used in place of $KI$. Tincture of iodine is characterized by the presence of alcohol.