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Cr₂O₃ + 3H₂SO₄ --> Cr₂(SO₄)₃ + 3H₂O
Cr₂(SO₄)₃ + 6NH₃ + 6H₂O --> 2Cr(OH)₃ + 3(NH₄)₂SO₄
Związek A to siarczan (VI) chromu (III) a związek B to wodorotlenek chromu (III)