Q. 204.6( 5 Votes )

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
A. (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.

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