Q. Which of the following reactions are exothermic? 1) C + O2 → CO22) 2Mg + O2 → 2MgO3) CuSO4 + 5H2O → CuSO4.5H2O4) All the above
A) 2
B) 1
C) 4
D) 3
✔ Correct Answer: 4
Exam Insight
All the above reactions are exothermic. These reactions release energy in the form of heat or light.