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Exothermic reactions are1) 2H2+O2 ⇒2H20+Heat2) 2C2H2+5O2⇒4CO2+2H20+HeatEndothermic reactions are3) CH4+Heat ⇒CO+2H24) 2CO2+Heat⇒2CO+O2What are exothermic and endothermic reactions?Exothermic reactions are those reactions in which energy isreleasedand inendothermicreactions energy is required to proceed the reaction.1) & 2) areexothermicbecause energy isreleasedin reaction 3) & 4) areendothermicbecause energy is required so called endothermic reaction.For more information aboutexothermic & endothermicplease visit:brainly.com/question/2782285#SPJ4...