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why is Fe0(s) not formed in stoichio...

why is ` Fe0(s)` not formed in stoichiometric compostion ?

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This is because some `Fe^(2+)` ions in FeO are replaced by `Fe^(3+)` ions. As `3 Fe^(2+)` ions are replaced by `2 Fe^(3+)` ions to maintain electrical neutrality , there is less amount of metal as compared to stoichiometric proportion.
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