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Question

The metal iron (Fe) when exposed to moist atmosphere forms hydrated iron oxide as per the following reaction -
Fe+O2+YFe2O3.nH2O

This process is known as rusting which does not take place in the absence of ‘Y’. Identify ‘Y’ in the reaction.

A
Fe(OH)2
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B
Fe(OH)3
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C
H2O
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D
H2O2
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Solution

The correct option is C H2O
In the process of rusting, the metal iron reacts with oxygen and moisture that is present in the atmosphere to form hydrated iron oxide as per the following reaction:
2Fe(s)+32O2(g)+nH2O(l)Fe2O3.nH2O(s)

The moisture present in atmosphere refers to water vapour (H2O).

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