Ответ:
S + H₂ ⟹ H₂S
H₂S + 2KOH ⟹ K₂S + 2H₂O
K₂S + CuSO₄ ⟹ CuS↓ + K₂SO₄
S + O₂ ⟹ SO₂
SO₂ + 2NaOH ⟹ Na₂SO₃ + H₂O
Na₂SO₃ + CaCl₂ ⟹ CaSO₃↓ + 2NaCl.
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Ответ:
S + H₂ ⟹ H₂S
H₂S + 2KOH ⟹ K₂S + 2H₂O
K₂S + CuSO₄ ⟹ CuS↓ + K₂SO₄
S + O₂ ⟹ SO₂
SO₂ + 2NaOH ⟹ Na₂SO₃ + H₂O
Na₂SO₃ + CaCl₂ ⟹ CaSO₃↓ + 2NaCl.