Question

What is meant by ‘rusting’? With labelled diagrams, describe an activity to find out the conditions under which iron rusts.​

Answer 1

Answer:

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==>The process in which iron reacts with oxygen in the presence of moisture to form reddish brown coating of hydrated ferric oxide [Iron (III) oxide].Fe2O₃ xH₂0

Activity:

(i) Take three boiling tubes A, B and C.

(ii) Pour some water in test tube A Put iron nails in it and cork it.

(iii) Pour boiled distilled water in another test tube B and put iron nails in it. Add 1 ml of ojl over it such that oil flo’ats over it and prevents the air from entering.

(iv) Take some iron nails in test tube C and put some anhydrous calcium chloride in it and cork it.

(v) Leave all the three test tubes for one day and then observe.

Observation:

==> Iron nails get rusted in test tube A because both air and water are present in it. Iron nails do not get rusted in B because there is water but no air. In C, rusting will not take place because there is neither air nor water. Conclusion: Iron gets rusted in the presence of air and water.

Answer 2

Answer:

When iron is exposed to air and moisture for a very long time, it gets covered with a brown flaky substance. This brown flaky substance is called rust and the process is called rusting.

this is the answer

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