Which of the following is not an endothermic reaction?(a) CaCO₃ -----> CaO + CO₂(b) 2H₂O ------> 2H₂ + O₂(c) 6CO₂ + 6H₂O -----> C₆₁₂O₆ + 6O₂(d) C₆H₁₂O₆ + 6O₂-----> 6CO₂ + 6H₂O

Correct Answer: (d) C6H12O6 + 6O2 -----> 6CO2 + 6H2O

Explanation: It is a reaction to the respiration process, in which glucose is oxidized to produce the energy needed by our body. Hence, it is an exothermic reaction.