Chemistry - Thermochemistry Question with Solution | TestHub
ChemistryThermochemistryEnthalpy of ReactionMedium2 minQB
ChemistryMediummultiple choice
Which of the following reaction(s) is/are endothermic? (one or more than one correct)
Options:(select one or more)
Answer:
A, B
Solution:
(a) For NO, the standard enthalpy of formation is Δ Hf = +90 kJ/mol. Thus, for 2 moles, Δ H = +180 kJ, indicating an endothermic reaction.
(b) The thermal decomposition of limestone (CaCO₃) requires heat, with Δ H ≈ +178 kJ. This is an endothermic process.
(c) The burning of carbon monoxide (CO) is a combustion reaction, which is exothermic.
(d) The hydrogenation of a C=C bond is an exothermic process, with Δ H ≈ -137 kJ.
Therefore, the endothermic reactions are (a) and (b).
Stream:JEESubject:ChemistryTopic:ThermochemistrySubtopic:Enthalpy of Reaction
⏱ 2mℹ️ Source: QB
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