Which among the following is (are) double displacement reaction(s)?
(i) Pb + CuCl2→ PbCl2 + Cu
(ii) Na2SO4 + BaCl2→ BaSO4 + 2NaCl
(iii) C + O2→ CO2
(iv) CH4 + 2O2→ CO2 + 2H2O
The reaction (i) is a type of displacement reaction as Pb displaces Cu and form a new compound PbCl2
The reaction (ii) is a type of double displacement reaction in which exchange of ions takes place.
The reaction (iii) is a type of combination reaction in which carbon and oxygen are combined together to form a single product that is CO2.
The reaction (iv) is a type of exothermic reaction as the burning of
natural gas (CH4) releases a large amount of energy.