Which of the following are combination reactions?(i) 2KClO3 \(\overset

1.	Which of the following are combination reactions?(i) 2KClO3 \(\overset{Heat}{\rightarrow}\) 2KCl + 3O2(ii) MgO + H2O → Mg(OH)2(iii) 4Al + 3O2→ 2Al2O3(iv) Zn + FeSO4→ ZnSO4 + FeA. (i) and (iii)B. (iii) and (iv)C. (ii) and (iv)D. (ii) and (iii)
Answer» 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.

Which of the following are combination reactions?(i) 2KClO3 \(\overset{Heat}{\rightarrow}\) 2KCl + 3O2(ii) MgO + H2O → Mg(OH)2(iii) 4Al + 3O2→ 2Al2O3(iv) Zn + FeSO4→ ZnSO4 + FeA. (i) and (iii)B. (iii) and (iv)C. (ii) and (iv)D. (ii) and (iii)

Answer»

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.