What is the formal charge on the oxygen atom in `:C -=O:`

What is the formal charge on the nitrogen atom in HNO_(3) ? H-overset(..)underset(..)O-overset(":"overset(..)O":")overset(|)N=overset(..)underset(..)O

What is the formal charge on the central atom in N_(2)O ? :N-=N-overset(..)underset(..)O:

What is the formal charge on the chlorine atom in the oxyacid HOClO_(2) if it contains only single bonds?

According to the Lewis dot structure for ozone, what is the formal charge on the central oxygen atom? overset(..)underset(..)O=overset(..)O-overset(..)underset(..)O:

In H_(3)O^(+) the formal charge on the oxygen atom is :

What will be the formal charges on the three oxygen atoms in ozone ?

In NO_(3)^(-) ion the formal charge on the oxygen atom of N-O bond is

In PO_(4)^(3-) ion the formal charge on the oxygen atom of P-O bond is