Answer: Option (b) is the correct answer.
Explanation:
A substance that dissociates into ions upon dissolving in water is able to conduct electricity due to the movement of ions or electrons.
This is because conductivity is the ability of a substance through which electricity can flow due to the free movement of electrons.
For example, [tex]MgCl_{2}[/tex] is an ionic compound and when it is dissolved in water then it readily dissociates into magnesium and chlorine ions.
Therefore, it is able to conduct electricity.
Whereas [tex]H_{2}O_{2}[/tex], [tex]CH_{3}OH[/tex], and [tex]NH_{3}[/tex] are all non-polar in nature. Hence, they do not dissociate into ions.
So, they do not conduct electricity.
Thus, we can conclude that out of the given options [tex]MgCl_{2}[/tex] best conducts electricity in a aqueous solution.
