1. P2O3, FeCl3, SiH4, N2O3, Fe2S3, BaO,

CBr4, OF2, Ca3N2, ZnBr2, Cl2O7, H2S.

2.

CaO -- Ca(II), O(II)

PH3 -- P(III), H(I)

Al2O3 -- Al(III), O(II)

SO3 -- S(VI), O(II)

Cl2O7 -- Cl(VII), O(II)

CO2 -- C(IV), O(II)