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In test tube 2,oil cuts supply of air and nail due to which oxidation of nail is prevented and boil water is free from gases hence the nail in the test tube 2 is not rusted.
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The nail in the test tube 1 is highly rusted because the nail is in contact with water and air. The oxidation process is fast.
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No changes is observed in test tube 3. nail remains as it is because the calcium chloride absorbs moisture making the air dry thus preventing rusting of the nail.
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