CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
An unknown element X forms an oxide that dissolves in both dilute hydrochloric acid and dilute sodium hydroxide. The chloride of X is a solid with a high melting point.
Suggest what this information indicates about the nature of element X, its possible position in the Periodic Table, and its identity.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Suggest means: Apply what you know to an unfamiliar situation. There may be more than one acceptable answer. Reason from the principle you have learned to the new context, and say which principle you are using.
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