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CIE iGCSE Co-Ordinated Science C9.2 Uses of metals Water Exam Style Questions Paper 2

CIE iGCSE Co-Ordinated Science Paper 2 - All Chapters

Question

Equations representing reactions in the Contact process are listed.

  • reaction \(1\): \(S + O_2 \rightarrow SO_2\)
  • reaction \(2\): \(2SO_2 + O_2 \rightleftharpoons 2SO_3\)
  • reaction \(3\): \(H_2SO_4 + SO_3 \rightarrow H_2S_2O_7\)
  • reaction \(4\): \(H_2S_2O_7 + H_2O \rightarrow 2H_2SO_4\)

Which row identifies the reactions that use the stated conditions?

▶️ Answer/Explanation
Reaction \(2\), \(2SO_2 + O_2 \rightleftharpoons 2SO_3\), is the key catalysed step of the Contact process.
It requires a \(V_2O_5\) catalyst, a temperature of about \(450^\circ C\), and a pressure of about \(2\) atmospheres — all three conditions apply to reaction \(2\).
✅ Answer: (B)

Question

Which row shows the properties of aluminium that make it useful in the manufacture of overhead electrical cables?

▶️ Answer/Explanation
Aluminium is used for overhead electrical cables because it has low density (making it lightweight for suspension) and good electrical conductivity (allowing efficient transmission of electricity). Both properties are essential.
✅ Answer: (D)

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: While aluminium is more reactive than iron (C), this is not a reason for its use in aircraft. Its key advantages are:

  • Low density alloys reduce weight (A)
  • Malleability allows shaping (B)
  • Corrosion resistance increases durability (D)

Reactivity is irrelevant to its aircraft applications.

Question 

Four properties of metals are listed:

1. high melting point
2. low density
3. resistance to corrosion
4. conducts electricity

Which properties make aluminium suitable for use in cans containing drinks?

A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 3 and 4

▶️Answer/Explanation

Answer: C

Explanation: For drink cans, the most important properties are:

  • Low density (2) – makes cans lightweight
  • Resistance to corrosion (3) – prevents reaction with drinks

While electrical conductivity (4) is a metallic property, it’s not relevant for cans. High melting point (1) isn’t specifically required for this application.

Question 

Some properties of aluminium are listed.

1. conducts electricity

2. malleable

3. resistant to corrosion

Which properties make aluminium suitable for use as food containers?

A. 1, 2 and 3

B. 1 and 2 only

C. 1 and 3 only

D. 2 and 3 only

▶️Answer/Explanation

Answer: D

Explanation: For food containers, malleability (2) allows shaping into containers, and corrosion resistance (3) prevents contamination. Electrical conductivity (1) is irrelevant for food containers, eliminating options A, B and C.

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