Question

C(s)  +  O2 (g)  →  Co2 (g)  is  which  type  of  reaction?

a)  Exothermic  reaction b)  endothermic  reaction

c)  Decompose  reaction d)  displacement  reaction

Answer 1

a ) exothermic change 
as the above reaction is burning of carbon.

Answer 2

answer : option (a) exothermic reaction.

explanation: when carbon burns in the presence of oxygen, carbon dioxide forms as a product and also some of heat energy evolves .

reaction is...

$C(s)+O_2(g)\rightarrow CO_2(g)+Q$

here Q denotes some amount of heat energy is evolved.

but we know, an exothermic reaction is a process in which heat energy is given off.

so, reaction of carbon and oxygen is an exothermic reaction.

hence, option (a) is correct choice.