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  • Which of the following are combination reactions?

Which of the following are combination reactions?

(i)2KClO_3\overset{heat}{\rightarrow} 2KCl + 3O_2

(ii)MgO + H_2O\rightarrow Mg(OH)_2

(iii) 4Al + 3O_2\rightarrow 2Al_2O_3

(iv) Zn + FeSO_4\rightarrow ZnSO_4 + Fe

(a) (i) and (iii)                 (b) (iii) and (iv)

(c) (ii) and (iv)                (d) (ii) and (iii)

Answers (1)

Ans. (d)

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.

(i) )2KClO_3\overset{heat}{\rightarrow} 2KCl + 3O_2

Decomposition reaction.

(ii)MgO + H_2O\rightarrow Mg(OH)_2

Combination reaction as magnesium oxide and water combine to form magnesium hydroxide

(iii) 4Al + 3O_2\rightarrow 2Al_2O_3

Combination reaction as aluminium combines with oxygen to form aluminium oxide

(iv)Zn + FeSO_4\rightarrow ZnSO_4 + Fe

Displacement reaction.

 

 

 

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