Blocks of magnesium are bolted to the steel hull of a ship. After some months the blocks have to be replaced.
Statement 1: the magnesium is oxidised instead of the iron because magnesium atoms lose electrons more readily than iron atoms
Statement 2: if the hull did rust, the iron would be reduced, because it gains oxygen
Statement 3: the blocks have to be replaced because the magnesium is gradually used up as it corrodes
Which statements are correct?
1 and 2 only
2 and 3 only
1 and 3 only
1, 2 and 3
42 exam-style questions on Edexcel GCSE Chemistry 6.1 Transition metals, alloys and corrosion, covering 6.1.1 Properties of transition metals, 6.1.2 Corrosion and its prevention, and 6.1.3 Alloys and the uses of metals. Each one has a worked solution and a mark scheme showing where the marks go.