Объяснение:
2) K2O, AlCl3, B2O3, NH3
3) Fe(III)Cl(I), Mg(II)S(II), Al(III)S(II), Zn(II)S(II), S(IV)O(II), Fe(III)S(II), H(I)S(II), P(III)H(I), Ca(II)O(II), Ag(I)S(II)