Chúc bạn học tốt!!!

Đáp án:

 

Giải thích các bước giải:

1.

`O` luôn có hóa trị: `II`

`H` luôn có hóa trị: `I`

`NO: N: II`

`NO_2: N: IV`

`N_2O_3, NH_3: N: III`

`N_2O_5: N: V`

`HCl: Cl:I`

`SO_4: II`

`PO_4: III`

`Ba: II`

`OH: I`

`Na: I`

`NO_3: I`

`K: I`

`CO_3: II`

`Ca: II`

`HCO_3: I`

`HPO_4: II`

`HSO_4: I`

`Al: III`

`Mg: II`

`H_2PO_4: I`

2.

_CTHH: 

`P_2O_3, NH_3, FeO, Cu(OH)_2, Ca(NO_3)_2, Ag_2SO_4, Ba_3(PO_4)_2, Fe_2(SO_4)_3, Al_2(SO_4)_3, NH_4NO_3`

Em tham khảo nha:

\(\begin{array}{l}
1)\\
NO:N(II),O(II)\\
N{O_2}:N(IV),O(II)\\
{N_2}{O_3}:N(III),O(II)\\
{N_2}{O_5}:N(V),O(II)\\
N{H_3}:N(III),H(I)\\
HCl:H(I),Cl(I)\\
{H_2}S{O_4}:H(I),S{O_4}(II)\\
{H_3}P{O_4}:H(I),P{O_4}(III)\\
Ba{(OH)_2}:Ba(II),OH(I)\\
N{a_2}S{O_4}:Na(I),S{O_4}(II)\\
NaN{O_3}:Na(I),N{O_3}(I)\\
{K_2}C{O_3}:K(I),C{O_3}(II)\\
{K_3}P{O_4}:K(I),P{O_4}(III)\\
Ca{(HC{O_3})_2}:Ca(II),HC{O_3}(I)\\
N{a_2}HP{O_4}:Na(I),HP{O_4}(II)\\
Al{(HS{O_4})_3}:Al(III),HS{O_4}(I)\\
Mg{({H_2}P{O_4})_2}:Mg(II),{H_2}P{O_4}(I)
\end{array}\)