Are you referring to this question?
Which reaction is endothermic?
a) 2BrCl mc019-1.jpg Br2 + Cl2 + 29.3 kJ
b) 2H2 + O2 mc019-2.jpg 2H2O + 572 kJ
c) C + O2 mc019-3.jpg CO2 + 394 kJ
d) N2O4 + 59 kJ mc019-4.jpg 2NO2
If so, the answer would be letter D.
when you say endothermic reaction, heat is absorbed, heat is released in exothermic.
