Write an activity to show that rusting of iron require both oxygen and water
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Pour water (boiled/distilled) in test-tube-2, add some oil and cork it. Put some anhydrous calcium chloride in test-tube-3 and cork it. After 2-3 days we observe that the nails in test-tube 1 rust because they are exposed to air and water both, while nail in test-tube 2 and 3 do not rust
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