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In the rusting activity, nails kept in boiled distilled water with a layer of oil on top did not rust mainly because

Question
In the rusting activity, nails kept in boiled distilled water with a layer of oil on top did not rust mainly because
The oil itself chemically reacts with iron to prevent rusting
The oil prevented air from dissolving into the water, so there was no dissolved air
Boiled water is not real water
The nails used were not actually iron
Answer
The oil prevented air from dissolving into the water, so there was no dissolved air
Detailed Explanation
The oil layer stopped air from dissolving into the boiled water, so there was no dissolved oxygen available for rusting.
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