A) heat of reaction
B) heat of formation
C) heat of bond formation
D) All of the above
Correct Answer: D
Solution :
According to Hess's law "when a chemical change be made to take place in two or more different ways in one or in several steps, the value of enthalpy changed always remain constant. Hess's law is used in the determination of heat of reaction, heat of formation, heat of bond formation heat of combustion etc.
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