O-LevelChemistryBonding & Structure5070/11 · May/June 2018 · Q81 Mark

Ethane, C₂H₆, and ammonia, NH₃, are covalent compounds. The dot-and-cross diagrams of these compounds are shown. Which statements are correct? 1 A molecule of ethane contains twice as many hydrogen atoms as a molecule of ammonia. 2 An unreacted nitrogen atom has five outer electrons. 3 In a molecule of ethane, the bond between the carbon atoms is formed by sharing two electrons, one from each carbon atom.

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A1, 2 and 3

B1 and 2 only

C1 and 3 only

D2 and 3 only

✓ Correct answer

A: 1, 2 and 3

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Topic: Bonding & Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2018 Paper 1 Variant 1, question 8.

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