(a)[1]
Name the apparatus X.
(b)[1]
State why a stopper is fitted in Experiment B.
(c)[1]
State why the water in Experiment C is boiled prior to use.
(d)[1]
State why Experiment C includes a layer of oil.
(e)[2]
The setups are left for one week. Predict in which of the experiments the nail will have rusted. Explain your prediction.