When manganese dioxide reacts with hydrochloric acid, the manganese dioxide (MnO₂) reduces to MnCl₂ while hydrochloric acid (HCI) oxidizes to chlorine gas (Cl₂).
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(i) Ca(OH)₂ + CO₂ → CaCO₃ + H₂O (ii) Fe + CuSO₄ → FeSO₄ + Cu (iii) KClO₄⁻ → KCl + 2O₂ (iv) Cu + 2HNO₃ → ...
(i) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂ (ii) 2AlCl₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaCl₂ (iii)2KClO₃ → 2KCl + 3O₂ (iv) Mg + H₂O → ...
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