Metal $$\(X\)$$ acts as a sacrificial metal to prevent iron from corroding. Metal $$\(X\)$$ does not act as a sacrificial metal to prevent aluminium from corroding. What is $$\(X\)$$ ?
A.
copper
B.
magnesium
C.
silver
D.
zinc
Exam No：0620_s24_qp_22 Year：2024 Question No：25
Answer:
D
Knowledge points:
9.6.1. Describe the ease in obtaining metals from their ores, related to the position of the metal in the reactivity series
9.6.2.1. the burning of carbon (coke) to provide heat and produce carbon dioxide
9.6.2.2. the reduction of carbon dioxide to carbon monoxide
9.6.2.3. the reduction of iron(III) oxide by carbon monoxide
9.6.2.4. the thermal decomposition of calcium carbonate / limestone to produce calcium oxide
9.6.2.5. the formation of slag Symbol equations are not required
9.6.3. State that the main ore of aluminium is bauxite and that aluminium is extracted by electrolysis
9.6.4.1.
9.6.4.2.
9.6.4.3.
9.6.4.4.
9.6.4.5.
9.6.5.1. the role of cryolite
9.6.5.2. why the carbon anodes need to be regularly replaced
9.6.5.3. the reactions at the electrodes, including ionic half-equations
Solution:
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