Question

What should be the charge on $C{O}_3$ in $FeC{O}_3$ if the valency of iron is 2?

• A. 5
• B. 6
• C. 4
• D. None of the above

Answer 1

The correct option is B 6

In $FeC{O}_3$ :
It is given that valency of iron is 2 and we know that iron is a metal so it will donate its valence electrons to become the positively charged ion . So while forming $FeC{O}_3$ molecule iron will give out 2 electrons to gain positive charge of +2 and $C{O}_3$ has to accept 2 electrons to form the molecule.Therefore,$C{O}_3$ on accepting 2 electrons will gain 2 negative charge and will become $C{O}_3^{2-}$.