Which of the following formation is endothermic reaction?
Correct answer: C. N2(g) + O2 (g) -> N2O2 (g)
- A. 2 H2 (g) + O2 (g) -> 2H2O (l)
- B. C(s) + O2 (g) -> CO2(g)
- C. N2(g) + O2 (g) -> N2O2 (g)
- D. None of these
Explanation
Because heat is absorbed in this reaction. All the other reactions are exothermic as the heat is released during the process.
This question appeared on the UHS MDCAT 2008 paper, which you can sit online with every answer explained.
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About Exothermic and Endothermic Reactions
Exothermic reactions release heat to the surroundings and have negative enthalpy change, while endothermic reactions absorb heat and have positive enthalpy change. The topic uses energy profiles to identify reactants, products and activation energy, and includes bond energy, enthalpy diagrams, calorimetry and Hess's law for calculating overall heat changes.
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