CIE iGCSE Co-Ordinated Science C9.6 Extraction of metals Exam Style Questions Paper 1
Question
What are the products of the thermal decomposition of calcium carbonate, CaCO₃?
A. Calcium and carbon dioxide
B. Calcium, carbon, and oxygen
C. Calcium oxide and carbon dioxide
D. Calcium oxide and carbon monoxide
▶️Answer/Explanation
Answer: C
Explanation: When calcium carbonate is heated, it decomposes into calcium oxide (CaO) and carbon dioxide (CO₂).
Question
Bauxite is the main ore of aluminium. Which method is used to extract pure aluminium from bauxite?
A. Fractional distillation
B. Electrolysis
C. Neutralisation
D. Thermal decomposition
▶️Answer/Explanation
Answer: B
Explanation: Aluminium is extracted from bauxite using electrolysis. This process involves passing an electric current through molten aluminium oxide to separate the aluminium metal.
Question
Which metal is extracted from its ore by heating with carbon?
A copper
B magnesium
C potassium
D sodium
▶️Answer/Explanation
Ans :A
Question
The diagram shows a metal being extracted from its powdered ore using carbon.
What happens to the ore in this reaction?
A It burns.
B It decomposes.
C It is oxidised.
D It is reduced.
▶️Answer/Explanation
Ans 😀
Question
Metal X is extracted from its ore by heating the ore with carbon.
Which statement explains why carbon is used?
(A) Carbon is a non-metal.
(B) Carbon is more reactive than X.
(C) Carbon reacts with oxygen in the air.
(D) Carbon is less reactive than X.
▶️Answer/Explanation
Ans: B
Question
Metal X is extracted from its ore by heating the ore with carbon.
Which statement explains why carbon is used?
(A) Carbon is a non-metal.
(B) Carbon is more reactive than X.
(C) Carbon reacts with oxygen in the air.
(D) Carbon is less reactive than X.
▶️Answer/Explanation
Ans : B
Question
Iron is extracted from its ore in the blast furnace.
One of the reactions involved is shown.
Fe2O3 + 3CO → 2Fe + 3CO2
Which statement is correct?
A Iron(III) oxide and carbon monoxide are both oxidised.
B Iron(III) oxide and carbon monoxide are both reduced.
C Iron(III) oxide is oxidised and carbon monoxide is reduced.
D Iron(III) oxide is reduced and carbon monoxide is oxidised.
▶️Answer/Explanation
Ans : D
Question
Aluminium is a ……1…… resource. It is found in the ore bauxite where it is present in aluminium oxide.
Pure aluminium is extracted from aluminium oxide by ……2…… .
Which words complete gaps 1 and 2?
▶️Answer/Explanation
Ans: A
Question
To extract a metal from its ore, a metal oxide is mixed with carbon and heated as shown.
The limewater turns cloudy.
Which term describes what happens to the metal oxide?
(A) combustion
(B) neutralisation
(C) oxidation
(D) reduction
▶️Answer/Explanation
Ans: D
Question
Which metal is extracted from its ore by electrolysis?
(A) aluminium
(B) copper
(C) gold
(D) iron
▶️Answer/Explanation
Ans : A
Question
Which statement about aluminium is correct?
(A) It is extracted from bauxite by heating with carbon.
(B) It is extracted from bauxite by electrolysis.
(C) It is extracted from hematite by heating with carbon.
(D) It is extracted from hematite by electrolysis.
▶Answer/Explanation
Ans : B