Answers

2015-01-20T16:18:31+05:30
Take three small iron pieces and fut them into three test tubes and name the test tube as A,B and C. in tube A put some water and leave it undisturbed. In tube B put some cotton and leave it undisturbed. In tube C put some wax and leave it undisturbed.
OBSERVATION :--- 
iron kept in test tube A is covered with a reddish brown coating of a substance called as rust.
Conclusion:-
for rusting of an piece of iron it should be in contact with oxygen.

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