why is rusting of iron considered as chemical change .
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Rusting of iron is a chemical change because a new substance iron oxide is formed. The presence of oxygen and water or water vapour is essential for rusting. Rusting of iron is a continuous process which slowly eats up the iron objects and makes them useless.
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WHEN IRON COMES IN CONTACT WITH OXYGEN,WATER IT WILL GET RUSTED CHEMICAL FORMULA IS
FE+O2+H2O
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