Answer :

(a)


This is an example of displacement reaction. Displacement reaction is one in which more reactive component of a reactant displaces the comparatively lesser reactive component.


(b)


When magnesium is burned in air , then the magnesium reacts with nitrogen in the air and some magnesium nitride is also formed.


(c)


This is an example of displacement reaction. Displacement reaction is one in which more reactive component of a reactant displaces the comparatively lesser reactive component.


(d)


This is an example of combustion reaction. In such a reaction the reactant burns in oxygen to produce carbon dioxide and water. It is also an exothermic reaction as it evolves a lot of heat. It is also known as oxidation reaction.


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