Which of the following are combination reactions?

(i) 2KClO3 2KCl + 3O2


(ii) MgO + H2O Mg(OH)2


(iii) 4Al + 3O2 2Al2O3


(iv) Zn + FeSO4 ZnSO4 + Fe

In reaction (ii), MgO + H2O Mg(OH)2


MgO and water combined together to form a single product, i.e., magnesium hydroxide.


In reaction (iii), 4Al + 3O2 2Al2O3


Aluminium combines with oxygen to form a single product. i.e., aluminum oxide


Hence, both are examples of combination reactions.

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