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Identify the type of reaction in the fol...

Identify the type of reaction in the following examples :
(i) `Na_(2)SO_(4)(aq) + BaCl_(2)(aq) to BaSO_(4)(s) + 2NaCl(aq)`
(ii) `Fe(s) + CuSO_(4)(aq) to FeSO_(4)(aq) + Cu(s)`
(iii) `2H_(2)(g) + O_(2)(g) to 2H_(2)O (l)`

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(i) It is an example of double displacement reaction.
(ii) It is an example of displacement reaction.
(iii) It is an example of combination reaction.
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