O-LevelChemistryBonding & Structure5070/11 · May/June 2015 · Q91 Mark

A gas cylinder is placed in each of the four corners of a square room. Each cylinder contains a different gas stored under the same pressure. The gases are released at exactly the same time. Which gas will reach the centre of the room first?

Aammonia, NH₃

Bargon, Ar

Ccarbon monoxide, CO

Dchlorine, Cl₂

✓ Correct answer

A: ammonia, NH₃

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2015 Paper 1 Variant 1, question 9.

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