Home / iGCSE Chemistry (0620) Core:9.6 Extraction of metals: Exam Style Questions Paper 1

iGCSE Chemistry (0620) Core:9.6 Extraction of metals: Exam Style Questions Paper 1- New Syllabus

iGCSE Chemistry (0620) Core Paper 1 - All Chapters

Question

Which statements about aluminium are correct?
  1. It is more reactive than calcium.
  2. The main ore of aluminium is bauxite.
  3. It can be extracted from its oxide using carbon.
  4. Brass is an alloy of aluminium and copper.
A. 1 and 2
B. 1 and 3
C. 2 only
D. 3 and 4
▶️ Answer/Explanation
Correct Option: C

Detailed solution:

Statement 1 is false: in the reactivity series, calcium is above aluminium, meaning calcium is more reactive. Statement 2 is true: bauxite (Al₂O₃) is indeed the main ore from which aluminium is extracted. Statement 3 is false: aluminium is too reactive to be extracted by reduction with carbon; it must be extracted by electrolysis. Statement 4 is false: brass is an alloy of copper and zinc, not aluminium. Therefore, only statement 2 is correct.

Question

Which statements about metals are correct?
  1. Calcium reacts faster than magnesium with cold water.
  2. Aluminium is more easily extracted than iron from its ore.
  3. Copper reacts faster than iron with dilute hydrochloric acid.
  4. Potassium and silver are both good conductors of electricity.
A. 1 and 2
B. 1 and 4
C. 2 and 3
D. 3 and 4
▶️ Answer/Explanation
Correct Option: B

Detailed solution:

Calcium is above magnesium in the reactivity series, so it reacts more vigorously with cold water, making statement 1 correct. Aluminium is more reactive than iron and is extracted by electrolysis, which is much harder and costlier than extracting iron in a blast furnace, so statement 2 is false. Copper sits below hydrogen in the reactivity series and cannot react with dilute acids at all, whereas iron does, so statement 3 is also false. All metals are good conductors of electricity, so both the highly reactive potassium and the unreactive silver conduct well, making statement 4 true. Only 1 and 4 are correct.

Question

Which statement about the extraction of iron from hematite is correct?

A. Air is blown into the blast furnace to oxidise the molten iron.
B. Carbon dioxide is reduced by coke to carbon monoxide.
C. Hematite is oxidised by carbon to molten iron.
D. The slag produced is denser than molten iron.

▶️ Answer/Explanation
Inside a blast furnace, carbon dioxide gas rises and reacts with fresh incoming hot coke (carbon), causing the carbon dioxide to lose oxygen and undergo reduction into carbon monoxide gas ($C + CO_2 \rightarrow 2CO$). This makes statement B correct, as carbon monoxide serves as the primary reducing agent for the furnace. The remaining options are false because hematite undergoes reduction rather than oxidation, air is injected to combust coke to provide thermal energy rather than oxidize iron, and slag floats safely on top because it is significantly less dense than molten iron.
✅ Answer: (B)
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