Chemistry · May / June 2018 · Paper 12 · Question 8

Ethane, C2H6, and ammonia, NH3, are covalent compounds. The dot-and-cross diagrams of these compounds are shown. [dot-and-cross diagrams of ethane and ammonia] 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.

1. A1, 2 and 3
2. B1 and 2 only
3. C1 and 3 only
4. D2 and 3 only

As printed in the paper