Question

The salt whose aqueous solution will have no effect on either red litmus or blue litmus is ______.

Options

• potassium sulphate

• sodium carbonate

• ammonium sulphate

• sodium acetate

Answer 1

The salt whose aqueous solution will have no effect on either red litmus or blue litmus is potassium sulphate.

Explanation:

Potassium sulphate (K₂SO₄) is formed from a strong acid, sulphuric acid (H₂SO₄), and a strong base, potassium hydroxide (KOH). On dissolving in water, K₂SO₄ hydrolyses to form equal amounts of  H⁺ and OH⁻ ions. As the salt solution of K₂SO₄ is neutral, it has no effect on red or blue litmus paper.