Verified answer

H₂S + 2KOH = K₂S + 2H₂O

K₂S + 2HCl = H₂S + 2KCl

2H₂S + O₂ = 2S + 2H₂O

S + H₂ = H₂S

Cu + S = CuS

2CuS + 3O₂ = 2CuO + 2SO₂

SO₂ + 2KOH = K₂SO₃ + H₂O

K₂SO₃ + 2HCl = 2Kcl + SO₂ + H₂O

H₂O + SO₂ = H₂SO₃

H₂SO₃ = SO₂ + H₂O

H₂SO₃ + Br₂ + H₂O   = H₂SO₄ +2HBr

SO₃ + H₂O =H₂SO₄

H₂SO₄ + 2NaOH = Na₂SO₄ + 2H₂O

Na₂SO₄ + HNO₃(к) = H₂SO₄ + 2NaNO₃