CIE iGCSE Co-Ordinated Science C7.2 Oxides Exam Style Questions Paper 1
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
Which substance is a basic oxide?
(A) calcium oxide
(B) carbon dioxide
(C) nitrogen dioxide
(D) sulfur dioxide
▶️Answer/Explanation
Ans: A
Question
Four different oxides are listed.
1 calcium oxide
2 lithium oxide
3 nitrogen oxide
4 phosphorus oxide
Which oxides are acidic oxides?
(A) 1 and 2
(B) 1 and 3
(C) 2 and 4
(D) 3 and 4
▶️Answer/Explanation
Ans : D
Question
The diagram shows part of the human alimentary canal and associated organs.
Which labels identify the liver, pancreas and stomach?
▶️Answer/Explanati
Ans: D
Question
Which substance is classified as an acidic oxide?
(A calcium oxide
(B) carbon dioxide
(C) lithium oxide
(D) sodium oxide
▶️Answer/Explanation
Ans: B
Question
Which row describes lime and the solubility of limestone in water?
▶️Answer/Explanation
Answer: C
Explanation: Lime (calcium oxide) is a basic oxide, and limestone (calcium carbonate) is insoluble in water.
Question
Which row identifies the types of oxides?
| Acidic Oxides | Basic Oxides |
|---|---|
| A. CaO, Na2O | CO2, SO2 |
| B. CaO, SO2 | CO2, Na2O |
| C. CO2, Na2O | CaO, SO2 |
| D. CO2, SO2 | CaO, Na2O |
▶️Answer/Explanation
Answer: D
Explanation: Acidic oxides (e.g., CO2, SO2) are typically formed by non-metals, while basic oxides (e.g., CaO, Na2O) are formed by metals.