CIE iGCSE Co-Ordinated Science C7.2 Oxides Exam Style Questions Paper 2
Question
Chromium(III) oxide reacts with dilute hydrochloric acid and with aqueous sodium hydroxide.
Which word describes chromium(III) oxide?
(A) acidic
(B) amphoteric
(C) basic
(D) neutral
▶️Answer/Explanation
Ans: B
Question
A student adds excess copper oxide powder to warm dilute sulfuric acid.
Aqueous copper sulfate is formed.
Which method is used to remove the unreacted copper oxide?
A chromatography
B crystallisation
C distillation
D filtration
▶️Answer/Explanation
Ans : D
Question
A student makes lists of acidic oxides and basic oxides.
Which oxides are not in the correct list?
A carbon dioxide and sodium oxide
B potassium oxide and sulfur dioxide
C nitrogen dioxide and sulfur dioxide
D potassium oxide and calcium oxide
▶️Answer/Explanation
Ans : B
Question
Zinc oxide reacts with both dilute sulfuric acid and aqueous sodium hydroxide. Which type of oxide is zinc oxide?
A) acidic
B) amphoteric
C) basic
D) neutral
▶️Answer/Explanation
Answer: B) amphoteric
Explanation: Zinc oxide is amphoteric because it reacts with both acids (e.g., sulfuric acid) and bases (e.g., sodium hydroxide) to form salts and water.