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The d & f Block Elements — Chemistry STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 ScienceChemistryThe d & f Block Elements1 Mark
Question
Analysis shows that FeO has a non-stoichiometric composition with formula $Fe_{0.95}O$. Give reason.
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Answer

FeO has a non-stoichiometric composition with the formula $Fe_{0.95}O$, because Fe is present in both +2 and +3 oxidation states.

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