1.

Which of the following are combination reactions?\((i) 2KClO_3\overset {Heat}\rightarrow2KCl + 3O_2\)(ii) MgO + H2O → Mg(OH)2 (iii) 4Al + 3O2 → 2Al2O3 (iv) Zn + FeSO4 → ZnSO4 + Fe(a) (i) and (iii) (b) (iii) and (iv)(c) (ii) and (iv) (d) (ii) and (iii)

Answer»

The correct option is(d) (ii) and (iii)

  • A reaction in which two or more reactants react together to form a single product, is called a combination reaction. 
  • In reaction (ii), MgO and H2O combine to form Mg(OH)2 and in reaction (iii), Al and O2 combine to form Al2O3.
  • Reaction (i) is decomposition and reaction(iv) is displacement reaction.


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