Which word equation represents the rusting of iron?

iron + oxygen + water \(\rightarrow\) anhydrous iron(II) hydroxide

iron + oxygen \(\rightarrow\) hydrated iron(II) oxide

iron + oxygen + water \(\rightarrow\) anhydrous iron(III) hydroxide

iron + oxygen + water \(\rightarrow\) hydrated iron(III) oxide

Chemistry

IGCSE&ALevel

CAIE

Exam No：0620_w24_qp_12 Year：2024 Question No：26

Answer:

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