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Question

is commonly known as rust. 


A
Iron oxide
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B
Copper oxide 
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C
Silver oxide
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Solution

The correct option is A Iron oxide
Iron on exposure to air reacts with oxygen and moisture to form a reddish-brown compound called hydrated iron oxide. This is commonly known as rust. 

4Fe+3O2+xH2O2Fe2O3.xH2O

The above reaction is a slow reaction and is also known as rusting or corrosion of iron. 

Chemistry

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