An example of a deliquescent substance is

Kingsley Thompson February 08, 2026

 An example of a deliquescent substance is

A. CuO

B. CaO

C. H2SO4

D. NaOH

The correct answer is D. NaOH ✅

Explanation:

A deliquescent substance is a substance that absorbs moisture from the air until it dissolves in the absorbed water to form a solution.

Examples of deliquescent substances:

  • Sodium hydroxide (NaOH) ✔

  • Calcium chloride (CaCl₂)

  • Potassium hydroxide (KOH)

NaOH absorbs water vapour from the atmosphere and becomes liquid.

Why others are incorrect:

  • CuO → Not deliquescent

  • CaO → Hygroscopic (absorbs moisture but does not dissolve into solution)

  • H₂SO₄ → Hygroscopic liquid, not classified as deliquescent solid

👉 Final Answer: D. NaOH

PQN: 5

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Kingsley Thompson

Posted by: Kingsley Thompson

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