(b) Which of the following will conduct electricity and which not?

MgCl₂, CCl₄, NaCl, CS₂, Na₂S

Solution:

(a) Ionic compounds contain electrically charged ions and conduct electricity, whereas covalent compounds have electrically neutral molecules and do not conduct electricity.

(b) Electrical conductors: MgCl₂, NaCl, Na₂S

Non-conductors: CCl₄, CS₂.