Chemistry · May / June 2023 · Paper 12 · Question 31

Pieces of magnesium can be attached to the steel hull of a ship to prevent rusting. This is sacrificial protection. Which statements about sacrificial protection are correct? 1 Iron atoms gain electrons and form hydrated iron(III) oxide. 2 Magnesium atoms gain electrons to form magnesium ions. 3 Magnesium is oxidised.

1. A1 and 2
2. B1 and 3
3. C2 and 3
4. D3 only

As printed in the paper