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Q.

Is it true that the coating of brown, flaky substance on the surface of iron is called rust?


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a

True

b

False  

answer is A.

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Detailed Solution

The above statement is true.
The coating of brown, flaky substance which forms on the surface of iron when it is kept exposed in moist air is called rust. The formula of rust is Fe2O3.xH2O. Rusting of iron needs both oxygen and water vapors. The reaction is:
2Fe (s)  + O2 (g)+  xH2O (g)  → Fe2O3.xH2O (s)
 
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Is it true that the coating of brown, flaky substance on the surface of iron is called rust?