1)CaS+2HNO₃=Ca(NO₃)₂+H₂S↑
2)Ca(NO₃)₂=Ca(NO₂)₂+O₂↑
3)Ca(NO₂)₂+H₂SO₄=CaSO₄↓+2HNO₂
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1)CaS+2HNO₃=Ca(NO₃)₂+H₂S↑
2)Ca(NO₃)₂=Ca(NO₂)₂+O₂↑
3)Ca(NO₂)₂+H₂SO₄=CaSO₄↓+2HNO₂