Question

$\huge\bf\underline\blue{QuesTion}$


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show an experiment to study that air and water are required for rusting of iron .

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Answer 1

Explanation:

EXPERIMENT TO PROVE THAT BOTH AIR AND WATER ARE NECESSARY FOR RUSTING OF IRON

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.

This shows that for rusting of iron both air and water are necessary.

even the diagram is posted pls refer

Answer 2

Answer:

$\huge{\mathbb{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\pink{R:}}}$

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$\tt\underline\red{Introduction:-}$

⇒ Rusting is the common term for corrosion of iron and steel. Rust is an iron oxide. It is usually red and formed by the reaction of iron and oxygen in the presence of water or air moisture. If sufficient time is given, any iron mass will eventually convert entirely to rust and disintegrate.

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$\tt\underline\blue{Aim:-}$

⇒ To study that air and water are required for rusting of iron.

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$\tt\underline\orange{Materials ~Required:-}$

• Three test tubes
• Iron nail
• Oil
• Calcium chloride

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$\tt\underline\pink{Theory:-}$

⇒ When merals are exposed to atmospheric conditions, they react with the environment to form undesirable compounds. This process is called corrosion.

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$\tt\underline\green{Procedure:-}$

1. Take three test tubes.
2. Mark these tubes as A, B and C, place iron nails in each of them.
3. Put boiled water in test tube A to remove any dissolved air. Add some oil and cork it.
4. Put some tap water in test tube B and cork it.
5. Put some anhydrous chloride in test tube C and cork it. It absorbs the moisture from the air.
6. Leave these test tubes for a few days and observe it.

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$\tt\underline\purple{Observation:-}$

• In test tube A - iron nail does not rust.

• In test tube B - iron nail rusts.

• In test tube C - iron nail does not rust.

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$\tt\underline\red{Conclusion:-}$

⇒ This shows that both air and water are necessary for iron to rust.

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$\tt\underline{Precautions:-}$

• Pour the boiling water into the test tube carefully.
• The test tubes should be sealed tightly using the cork.

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