CONDITIONS NECESSARY FOR RUSTING

Two clean nails each are placed in Five separate boiling tubes labelled 1, 2, 3, 4 and 5 To the first tap water is added. To the second tube 10cm3 of boiled water followed by oil are added. To the third a piece of cotton wool is placed half way the tube containing nails. Anhydrous Calcium chloride is placed on the wool .To the fourth the boiling tube is left as it was set up initially.To the fifth water containing salt is added to the nails.The tubes are Corked and left for about a week.Observe the following animation and note what happens to the nails.