câu 8:
a, co :c(II),O(II)
N2O3 : N(III), O(II)
HCL : H(I), O(II)
FE2O3 :FE(III), O (II)
b,
NO:N(II),O(II)
NO2:N(IV),O(II)
N2O3:N(III),O(II)
N2O5:N(V),O(II)
Nacl :na(I), cl(I)
AL2O3 AL(III), O(II)
FE(NO3)3 : FE(III), NO3(I)
H2SO4:H(I),SO2−4:(II)
H3PO4:H(I),PO4(III)
ZN(OH)2: ZN(II), OH(I)
FE2(SO4)3: FE(III), SO4(II)
NA2S : NA (I ), S(II)
NAHCO3 : NA(I), HCO3 (I)
HCL : H(I), CL(I)
Ba(OH)2:Ba(II),OH(I)
Na2SO4:Na(I),SO4(II)
K3PO4:K(I),PO4(III)
Ca(HCO3)2:Ca(II),HCO3(I