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1. \(H_{2(g)}+Cl_{2(g)}→2HCl_{(g)}\) is a
2. Photolysis is a decomposition reaction caused by
3. A reaction between carbon and oxygen is represented by \(C_{(s)}+O_{2(g)}→CO_{2(g)}+Heat\)
In which of the type(s), the above reaction can be classified?

(i) Combination reaction
(ii) Combustion reaction
(iii) Decomposition reaction
(iv) Irreversible reaction