Which of the following are combination reactions?
  1. $2KClO_3 \xrightarrow {heat} 2KCl + 3O_2$
  2. $MgO +H_2O \rightarrow Mg(OH)_2 $
  3. $4Al + 3O_2 \rightarrow 2Al_2O_3$
  4. $ Zn+ FeSO_4\rightarrow ZnSO_4 + Fe$
(a) (i) and (iii)
(b) (iii) and (iv)
(c) (ii) and (iv)
(d) (ii) and (iii)

AcademicChemistryNCERTClass 10

Correct Answer: (d) (ii) and (iii)

Explanation: In combination reaction, two reactants react to form a single product hence option ii) and iii) represents combination reactions.

Updated on 10-Oct-2022 13:27:09