Question

Which of the following does not conduct electricity in a molten state?
A.Iron
B.Magnesium oxide
C.Lithium fluoride
D.Sulphur

Answer 1

Hint: The electrical conduction is the movement of electrically charged particles through a transmission medium. Moreover, metals conduct electricity by the means of mobile electrons and non-metals do not conduct electricity.

Complete step by step answer:
In general conduction is a process of transmission of energy from one particle of the medium to another but each particle of the medium stays at its own position. Now, let’s discuss conductors and insulators.
In simple words, an electrical conductor is defined as the materials that allow the electricity to flow through them easily. The flow of electrons in a conductor is further known as electric current. Some of the examples of conductors are metals such as gold, iron, copper etc.
Now, insulators are materials that hinder the free flow of electrons from one particle of the element to another. Some of the examples are plastic, wood, glass etc.
Now, among the given options Sulphur is a nonmetal and does not conduct electricity whereas lithium fluoride and magnesium oxides are ionic compounds and they further contain ions that conduct electricity easily in the molten state. Iron is also a metal and it can conduct electricity.

Hence, option D is correct.

Note: There are some of the factors that affect the electrolytic conduction. These factors are concentration of ions, nature of electrolyte, temperature etc. Moreover, some of the typical examples of electrolytes that conduct electricity either in molten form or aqueous state ate NaCl, KCl etc.