The articles made of iron when placed in moist air get covered with reddish-brown powdery substance.. Is this physical change or chemical change explain
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it is a chemical change because the reddish-brown substance which you mentioned is nothing but rust and the process is called rusting. rusting is a chemical process in which iron reacts with oxygen in presence of moisture to produce a reddish brown substance called rust
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articles made of iron when placed in moist air get covered with reddish Brown powdery substance because
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Iron undergo rusting or oxidation when it comes in contact with moisture which forms an reddish brown layer over the article
the rusting of iron is an example for corrosion , corrosion slways degrads the metal and the metal will lose its luster etc causing a huge damage to the article
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