Which of the following are combination reactions?
(i) 2KClO₃ + Heat → 2KCl + 3O₂
(ii) MgO + H₂O → Mg (OH)₂
(iii) 4Al + 3O₂ → 2Al₂O₃
(iv) Zn + FeSO₄ → ZnSO₄ + Fe
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(i) 2KClO₃ + Heat → 2KCl + 3O₂
(ii) MgO + H₂O → Mg (OH)₂
(iii) 4Al + 3O₂ → 2Al₂O₃
(iv) Zn + FeSO₄ → ZnSO₄ + Fe
[D] (ii) and (iii)
Combination reaction is a reaction in which two or more reactants react together to form a single product. In reaction (ii) MgO and H₂O combine to form Mg(OH)₂ and in reaction (iii), Al and O₂ combine to form 2Al₂O₃.