Home / iGCSE / Coordinated Sciences / C7.2 Oxides Paper 2

CIE iGCSE Co-Ordinated Science C7.2 Oxides Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

Which statement describes an amphoteric oxide?

A. It does not react with either sodium hydroxide or hydrochloric acid.
B. It reacts with sodium hydroxide but not hydrochloric acid.
C. It reacts with hydrochloric acid but not sodium hydroxide.
D. It reacts with both sodium hydroxide and hydrochloric acid.

▶️ Answer/Explanation
Amphoteric oxides can act as both acidic and basic oxides; they react with both acids and bases to form salts and water. Examples include ZnO and Al₂O₃. Therefore, the correct statement is that it reacts with both.
✅ Answer: (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
Potassium is a metal, so potassium oxide is a basic oxide, not an acidic oxide as listed.
Sulfur dioxide is a non-metal oxide, so it is an acidic oxide, not a basic oxide as listed.
Carbon dioxide is correctly acidic and sodium oxide is correctly basic, so only potassium oxide and sulfur dioxide are misplaced.
✅ Answer: (B)

Question

Sodium is a metal.

Silicon is a non-metal.

Both sodium and silicon form oxides.

Which statement is correct?

A. Sodium oxide is acidic and silicon dioxide is basic.
B. Sodium oxide is basic and silicon dioxide is acidic.
C. Sodium oxide and silicon dioxide are both acidic.
D. Sodium oxide and silicon dioxide are both basic.

▶️ Answer/Explanation
Metal oxides are generally basic, so sodium oxide (Na₂O) is basic. Non-metal oxides are generally acidic, so silicon dioxide (SiO₂) is acidic.
✅ Answer: (B)

Question

Which row describes metallic oxides and non-metallic oxides?

.

▶️ Answer/Explanation
Metals generally form basic oxides (e.g., CuO, CaO) that react with acids to form salts and water. Non-metals generally form acidic oxides (e.g., CO₂, SO₂) that react with bases to form salts and water. This is related to metallic and non-metallic character.
✅ Answer: (C)

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

More CIE iGCSE Co-Ordinated Science Paper 2 Questions..
Scroll to Top