Question

Describe the activity to show that oxygen and moisture both are essential

for rusting of iron.​

Answer 1

Answer:

Explanation:

Anhydrous calcium chloride is drying agent. So, it is added into test tube C to absorb all the moisture present in the air of test tube. ... But the nail present in test tube A rusts because in test tube A the nail was exposed to both air and water. This shows that for rusting of iron both air and water are necessary.

Answer 2

Answer:

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

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

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