Question

write an activity to demonstrate the nature of rust form of iron​

Answer 1

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☑ Take three test tubes A, B and C and place one clean iron nail in each of them.

• In the test tube A pour some water and close its mouth with the help of a cork.
• In the test tube B pour boiled water which does not contain dissolved air. Also pour some oil in test tube B to form a layer over boiled water. The layer of oil will prevent the entry of air in water.
• In the test tube C put some anhydrous calcium chloride and cork it. 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. Keep these test tubes undisturbed for some days.

☑ After some days, you will observe that the nail in test tube B does not rust because the nail was exposed only to water and no air was present in it.

☑ In the same way the nail present in test tube C does not rust because in this tube air is dry and water is not present. But the nail present in test tube A rusts because in test tube A the nail was exposed to both air and water.

Answer 2

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» Take three test tubes A, B and C and place one clean iron nail in each of them.

Φ In the $\mathscr\red{test \: tube \:A}</p><p>$ pour some water and close its mouth with the help of a cork.

In the $\mathscr\red{test\:tube\:B}</p><p>$ pour boiled water which does not contain dissolved air.

Φ Also pour some oil in $\mathscr\red{test\:tube\:B}</p><p>$ to form a layer over boiled water. The layer of oil will prevent the entry of air in water.

Φ In the $\mathscr\red{test\:tube\:C}</p><p>$ put some anhydrous calcium chloride and cork it. Anhydrous calcium chloride is drying agent.