Question

Which one of the following are prepared by electrolytic method ?
A. $Mg$
B. $Sn$
C. $S$
D. ${{F}_{2}}$

Answer 1

Hint: Generally halogens are obtained by the electrolysis of an aqueous solution of its compound. The compound is generally the salt of the halogen like sodium chloride, sodium fluoride etc.

Complete Step by Step Answer:
The aqueous solution of the salt of fluorine that is sodium fluoride on electrolysis gives a strong base sodium hydroxide along with the formation of hydrogen gas and fluorine gas. The reaction can be given as follows:
$2NaF+2{{H}_{2}}O\to 2NaOH+{{H}_{2}}+{{F}_{2}}$

Thus in this reaction two moles of salt of fluorine that is sodium fluoride undergo hydrolysis in aqueous state to produce two moles of a strong base that is sodium hydroxide along with the formation of one mole of hydrogen gas and one mole of fluorine gas. Thus we can write that chlorine gas can be obtained by the electrolysis of sodium chloride.

Magnesium is an alkaline earth metal so it can be obtained easily by the fused electrolysis method.
Thus the correct options are A and D.

Note: Fluorine is a group 17 element. It is also known as halogen element. It generally exists as a gas at room temperature. It is a greenish-yellow colored gas and has the atomic number of $9$.