Home / iGCSE Chemistry Multiple Choice (Extended) : 7.2 Oxides: Exam Style Questions Paper 2

iGCSE Chemistry Multiple Choice (Extended) : 7.2 Oxides: Exam Style Questions Paper 2

iGCSE Chemistry MCQ (Extended) Paper 2 - All Chapters
Question

Information about the solubility in water of four oxides is shown.

Which oxide, when added to water, gives a solution with a pH less than pH 7?

 name of oxidesolubility in water
Anitrogen dioxidesoluble
Bcopper(II) oxideinsoluble
Csilicon(IV) oxideinsoluble
Dbarium oxidesoluble
▶️ Answer/Explanation
Solution

Ans: A

Nitrogen dioxide (NO₂) dissolves in water to form a mixture of nitrous acid (HNO₂) and nitric acid (HNO₃), both of which are acidic (pH < 7). Copper(II) oxide and silicon(IV) oxide are insoluble so wouldn’t affect pH. Barium oxide is soluble but forms barium hydroxide, an alkaline solution (pH > 7).

Question

Which row describes zinc oxide and calcium oxide?

 zinc oxidecalcium oxide
Abasicacidic
Bacidicbasic
Camphotericacidic
Damphotericbasic
▶️ Answer/Explanation
Solution

Ans: D

Zinc oxide is amphoteric, meaning it can react with both acids and bases. Calcium oxide is a basic oxide that reacts with acids to form salts and water. Therefore, the correct combination is amphoteric for zinc oxide and basic for calcium oxide.

Question

The flow chart shows some properties of a metal oxide.

What is the metal oxide?

A) aluminium oxide
B) copper(II) oxide
C) iron(III) oxide
D) zinc oxide

▶️ Answer/Explanation
Solution

Ans: D

The key clues are that the metal oxide reacts with both acid (HCl) and base (NaOH) to form salt and water (amphoteric behavior), and is a component of brass. Zinc oxide (D) fits both criteria as it’s amphoteric and brass is a copper-zinc alloy. Aluminium oxide (A) is amphoteric but not in brass. Copper(II) oxide (B) and iron(III) oxide (C) are basic oxides that don’t react with NaOH.

Question

Zinc oxide is an amphoteric oxide. Which types of substances will react with zinc oxide?

A. acids and bases
B. acids only
C. bases only
D. neither acids nor bases

Answer/Explanation

Ans:

A

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