Final answer:
Salts are electrolytes that dissociate into ions in water and conduct electricity. Metals are good conductors of electricity due to their free electrons. Acids are electrolytes when dissolved in water, but they are poor conductors of electricity in pure form.
Step-by-step explanation:
(b) Salts are electrolytes, meaning they dissociate into ions in water and conduct electricity. Metals are good conductors of electricity due to their free electrons. Acids are electrolytes when dissolved in water, but they are poor conductors of electricity in pure form.
Salts, such as table salt (NaCl), are composed of ions and dissociate into those ions when dissolved in water. The presence of these ions allows them to conduct electricity. Metals, on the other hand, have mobile electrons that can move freely and conduct electricity in both solid and liquid states. Acids, like hydrochloric acid (HCl), can also dissociate into ions when dissolved in water, making them electrolytes. However, in their pure forms, acids are poor conductors of electricity.