Four solutions, namely fructose, ethanol, hydrochloric acid and sodium hydroxide filled in four separate beakers are connected one by one in an electric circuit with a bulb. The solutions in which the bulb will glow when current is passed are:

The question requires the student to identify the solutions that will conduct electricity and make the bulb glow. The student needs to remember that acids and bases are electrolytes that conduct electricity, whereas fructose and ethanol are nonelectrolytes that do not conduct electricity.