Question

Four solutions, namely glucose, alcohol, hydrochloric acid and sulphuric acid 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 ______.

Options

• Glucose and alcohol

• Alcohol and hydrochloric acid

• Glucose and sulphuric acid

• Hydrochloric acid and sulphuric acid

Answer 1

Four solutions, namely glucose, alcohol, hydrochloric acid and sulphuric acid 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 hydrochloric acid and sulphuric acid.

Explanation:

HCl and NaOH are strong electrolytes; they dissociate into ions (H⁺, Cl⁻ and Na⁺, OH⁻) in water and so conduct electricity, lighting the bulb. Fructose and ethanol are molecular (nonelectrolytes) and do not produce ions in solution, so the bulb will not glow.