1) S
S + H₂ = H₂S
S + Cl₂ = SCl₂
S + O₂ = SO₂
2) SO₃
SO₃ + BaO = BaSO₄
SO₃ + H₂O = H₂SO₄
SO₃ + 2KOH = K₂SO₄ + H₂O
3) Zn(OH)₂
Zn(OH)₂ + 2HBr = ZnBr₂ + 2H₂O
Zn(OH)₂ + 2LiOH = Li₂[Zn(OH)₄]
Zn(OH)₂ + 2CH₃COOH = (CH₃COO)₂Zn + 2H₂O
4) ZnBr₂
ZnBr₂ + 2AgNO₃ = 2AgBr↓+ HNO₃
3ZnBr₂ + 2Na₃PO₃ = Zn₃(PO₄)₂↓ + 6NaBr
ZnBr₂ + Cl₂ = ZnCl₂ + Br₂