QQuestion
The substance used for drying ammonia gas is:
(a) CaCl₂
(b) CaO
(c) H₂SO₄
(d) P₂O₅
✓Answer
(b) CaO
Explanation
Quick lime (CaO) is used for drying ammonia gas (NH₃) because it absorbs moisture without reacting with ammonia.
Concentrated H₂SO₄ and P₂O₅ cannot be used because they react with ammonia.
Anhydrous CaCl₂ is also not suitable because it forms an addition compound with ammonia.
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