(i) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
(ii) 2AlCl₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaCl₂
(iii)2KClO₃ → 2KCl + 3O₂
(iv) Mg + H₂O → Mg(OH)₂ + H₂
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(i) 2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
(ii) 2AlCl₃ + 3Ca(OH)₂ → 2Al(OH)₃ + 3CaCl₂
(iii)2KClO₃ → 2KCl + 3O₂
(iv) Mg + H₂O → Mg(OH)₂ + H₂
[B] (iv) Only
The balanced equation is: Mg + 2H₂0 → Mg(OH)₂ + H₂