Question

Which of the following is not an endothermic reaction?
(a) ${\mathrm{CaCO}}_3\underset{}{\to }\mathrm{CaO}+{\mathrm{CO}}_2$
(b) $2{\mathrm{H}}_2\mathrm{O}\underset{}{\to }2{\mathrm{H}}_2+{\mathrm{O}}_2$
(c) $6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}\underset{}{\to }{\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+6{\mathrm{O}}_2$
(d) ${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6+6{\mathrm{O}}_2\underset{}{\to }6{\mathrm{CO}}_2+6{\mathrm{H}}_2\mathrm{O}$

Answer 1

(d) C₆H₁₂O₆ + 6O₂ $\to$ 6CO₂ + 6H₂O
This is the reaction of respiration process in which glucose burns in oxygen to produce heat energy needed by our body. So, this reaction is an exothermic reaction.