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.
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