O-LevelChemistryOrganic Chemistry5070/12 · Oct/Nov 2016 · Q301 Mark

Which statement about the uses of gases is not correct?

AHelium is used in balloons because it is unreactive and less dense than air.

BHydrogen is used in an addition reaction with saturated vegetable oils to form margarine.

CNitrogen from the air is used in the manufacture of ammonia.

DOxygen is used in making steel and welding.

✓ Correct answer

B: Hydrogen is used in an addition reaction with saturated vegetable oils to form margarine.

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Topic: Organic Chemistry, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2016 Paper 1 Variant 2, question 30.

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