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Question
Which of the following oxide(s) of iron would be obtained on prolonged reaction of iron with steam?
Options
FeO
Fe2O3
Fe3O4
Fe2O3 and Fe3O4
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Solution
Fe3O4
Explanation -
Iron does not react with cold or hot water, but steam is passed over a red hot iron, it reacts to form iron (II, III) oxide and hydrogen gas.
`3"Fe"("s") + 4"H"_2"O"("g") overset(1023 - 1073 "K")(->) "Fe"_3"O"_4("s") + 4"H"_2("g")`
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