Parts of a steel winch used outdoors in wet weather are coated with grease. Other parts are galvanised with zinc. Both coatings are scratched during use.
Which statement correctly compares the protection after scratching?
The grease-coated steel may rust at the scratch, but the zinc can still protect the galvanised steel.
Both steel parts remain protected at the scratches because each coating still covers most of the surface.
Both steel parts may rust at the scratches because neither coating can protect exposed steel.
The zinc-coated steel may rust at the scratch, but the grease can still protect the grease-coated steel.
118 exam-style questions on AQA GCSE Chemistry 10.3 Using materials, covering 10.3.1 Corrosion and its prevention, 10.3.2 Alloys as useful materials, and 10.3.3 Ceramics, polymers and composites. Each one has a worked solution and a mark scheme showing where the marks go.