Answer :

(a)Reaction in which two or more substances combine to form a single substance are called combination reaction.

(b) C (s) + O2 (g) CO2 + Heat

Reaction is exothermic as heat is given from the reaction.

(c) N2 (g) + O2 (g) + Heat 2NO (g)

Reaction is endothermic as heat is given to the reaction.

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A metal X forms a waLakhmir Singh & Manjit Kaur - Chemistry