Which of the following gases could be collected by downward displacement of air?
Chlorine
Hydrogen
hydrogen chloride
Sulphur(IV) oxide
Explanation
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Gas can be collected based on density and solubility in water. By density it is upward delivery of gas or downward displacement of air. Hydrogen being less dense than air is collected by upward delivery that is downward displacement of air
The correct answer is:
A. Chlorine
Explanation:
Chlorine (Cl₂) is denser than air, so it can be collected by downward displacement of air.
For the other gases:
B. Hydrogen (H₂) is lighter than air and would rise, so it is collected by upward displacement.
C. Hydrogen chloride (HCl) is a gas that dissolves in water, so it would not be efficiently collected by displacement; it's typically collected in a gas syringe or by passing it through water.
D. Sulphur(IV) oxide (SO₂) is denser than air, but it is highly soluble in water, making it difficult to collect by displacement. It is typically collected over water in special containers.
Thus, chlorine is the gas that can be collected by downward displacement of air.
