Question

The three test tubes a b and c ( a ) test tube contain iron nail is water covered with oil ( b ) test tube contain iron nail in water present in the half of the test tube ( c ) test tube contains iron nail, anhydrous cacl2 and no water. In which test tube rusting will take place?

Answer 1

rusting takes place in test tube b
because rusting occurs both due to water and oxygen.
in test tube a it is covered by oil hence oxygen cannot reach the nail so it won't get rusted.
in test tube c anhydrous calcium chloride is present which absorbs the moistness hence oxygen alone cannot rust the nail.

Answer 2

Rusting will occur in a test tube (b) test tube containing iron nails in water present in the half of the test tube.

• Rusting is caused by both water and oxygen.
• The nail in test tube A is covered in oil, oxygen cannot reach it, and it will not rust.
• Anhydrous calcium chloride absorbs moisture in the test tube; oxygen alone cannot rust the nail.

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