O-LevelChemistryAcids, Bases & Salts5070/12 · May/June 2014 · Q211 Mark

Samples of three oxides, X, Y and Z, were added separately to dilute hydrochloric acid and to dilute sodium hydroxide. X and Y react with dilute hydrochloric acid but Z does not react. Y and Z react with aqueous sodium hydroxide but X does not react. Which type of oxide are each of X, Y and Z?

AX: acidic, Y: amphoteric, Z: basic

BY: acidic, X: amphoteric, Z: basic

CZ: acidic, X: amphoteric, Y: basic

DZ: acidic, Y: amphoteric, X: basic

✓ Correct answer

D: Z: acidic, Y: amphoteric, X: basic

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Topic: Acids, Bases & Salts, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2014 Paper 1 Variant 2, question 21.

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