50б Розставьте валентності будь ласка
а) K2SiO3 + 2HNO3 = 2KNO+H2SiO3
б) Na₂SO₄ + Mg(NO₃)₂ ≠
в) CuCl₂ + BaSO₄ ≠
г) Cr₂(SO₄)₃ + 6NaOH = 2Cr(OH)₃ + 3Na₂SO₄
д) K₂S + Hg(NO₃)₂ = HgS + 2KNO₃
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