Question

describe an experiment to show the conditions necessary for rusting of iron

Answer 1

take three beakers and label them as 1,2,and 3.

pour water in the 1 beaker and put the iron nail.

pour water and oil in the 2 beaker and put the iron nail.

pour water and paint in 3 beaker and put the iron nail.

here 1 beaker the iron nail will became rust
other 2 and 3 beaker the iron will not be rust because the paint and oil act as passive layer and it does not allow the other substance ti act but 1 st beaker it react with oxygen and became rust

Answer 2

Hello!!

Here is your answer..

Take three clean iron nails without any rust on them and three test tubes with corks. In test tube A, put a few lumps of anhydrous calcium chloride (a good drying agent which absorbs water vapour from the atmosphere). Put a layer of cotton wool and then the nail. Close the test tube with a cork. In test tube B, take some pure (distilled) water. Boil it for one minute to drive off any dissolved air. Then drop in the nail. To keep the air out, seal the water surface in the test tube by pouring molten wax on it (was will solidify on the cool water surface). Close the test tube with a cork. Half-fill test tube C with tap water and drop the nail in it. Close this test tube also with a cork. Leave the tubes for several days and then examine them. You will find that the nails in test tubes A and B have not rusted, while that in test tube C has rusted.

Conclusion: This experiment shows that for rusting to take place, both air (oxygen) and water are essential.

Hope it helps you!!