Which compound is formed when iron rusts?
A.
anhydrous iron(II) oxide
B.
anhydrous iron(III) oxide
C.
hydrated iron(III) hydroxide
D.
hydrated iron(III) oxide
Exam No：0620_s23_qp_22 Year：2023 Question No：IGCSE&ALevelChemistry2023IG0159
Answer:
D
Knowledge points:
9.5.1. State the conditions required for the rusting of iron and steel to form hydrated iron(III) oxide
9.5.2. State some common barrier methods, including painting, greasing and coating with plastic
9.5.3. Describe how barrier methods prevent rusting by excluding oxygen or water
9.5.4. Describe the use of zinc in galvanising as an example of a barrier method and sacrificial protection
9.5.5. Explain sacrificial protection in terms of the reactivity series and in terms of electron loss
Solution:
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