Which of the following substances conducts electricity?

Step-by-step solution

- (1) Diamond: Diamond does not conduct electricity. It is an insulator because it has no free electrons or ions to carry charge. The carbon atoms in diamond form a strong covalent network, preventing the free flow of electrons. - (2) Sulphur (solid): Sulphur in its solid form also does not conduct electricity. It is a non-metal and does not have free electrons or charged particles to facilitate conduction. - (3) Molten NaCl : Molten NaCl (sodium chloride in its liquid form) conducts electricity. When NaCl is heate