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Investigate the conditions required for rusting of iron

Three iron pieces put in different solutions and explain the process of working model


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.
iron kept in test tube A is covered with a reddish brown coating of a substance called as rust.
for rusting of an piece of iron it should be in contact with oxygen.

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