Question

2. Explain with the help an activity that for rusting, air and water are essential

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Answer 1

Answer: Take three test-tubes. Place clean iron nails in each test-tube.

1) Pour some water in test-tube-1, cork it.

2) Pour water (boiled/distilled) in test-tube-2, add some oil and cork it.

3) Put some anhydrous calcium chloride in test-tube-3 and cork it.

4)  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. This shows rusting of iron takes place in the presence of air and moisture both.

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