Question

What is the valency of iron in FeO ??​

Answer 1

In FeO, Oxidation number of oxygen(O)=-2(Highly electronegative), whereas the compound as a whole is electrically neutral. So the Valency or the oxidation number of iron is +2

Similarly, In Fe2O3, 2x+3(-2)=0 which implies oxidation number of fe here is +3.

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Answer 2

FeO Ferrous oxide is an inorganic compound  that is also known as wustite.

Explanation:

The valency of Fe in FeO is +2 is

⇒ x +(-2) =0

⇒ x = +2

Its Fe(II) Ferrous ion in FeO

The valency of Fe in FeO is +2