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2) Cr₃₊ + SO₄²⁻ = ? Cr₂(SO₄)₃ siarczan(VI) chromu(III)
3) Na⁺ + MnO₄⁻ = ? NaMnO₄ manganian(VII) sodu
4) Pb⁴⁺ + Cl⁻ = ? PbCl₄ chlorek ołowiu(IV)