CIE iGCSE Co-Ordinated Science C9.2 Uses of metals Water Exam Style Questions Paper 1
Question
Which gas is produced when zinc reacts with dilute hydrochloric acid?
(A) carbon dioxide
(B) hydrogen
(C) oxygen
(D) sulfur dioxide
▶️Answer/Explanation
Ans: B
Question
Which statement is not a reason why aluminium is used in aircraft manufacture?
A. It forms low density alloys.
B. It is malleable.
C. It is more reactive than iron.
D. It is resistant to corrosion.
▶️Answer/Explanation
Answer: C
Explanation: Aluminium is used in aircraft manufacture because it forms low-density alloys (A), is malleable (B), and is resistant to corrosion (D). However, its reactivity compared to iron (C) is not a reason for its use in aircraft. In fact, aluminium’s reactivity is managed through alloying and surface treatments.
Question
Which statement is not a reason why aluminium is used in aircraft manufacture?
A. It forms low-density alloys.
B. It is malleable.
C. It is more reactive than iron.
D. It is resistant to corrosion.
▶️Answer/Explanation
Answer: C. It is more reactive than iron.
Explanation: Aluminium is used in aircraft manufacture because it forms low-density alloys, is malleable, and is resistant to corrosion. Its reactivity is not a factor in its use for this purpose.