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MDCAT - UHS Past Papers - Chemistry - Chap No 5 Quiz

Attempt 10 MCQs on MDCAT - UHS Past Papers - Chemistry - Chap No 5 | Quiz 2

11. Lattice energy of an ionic crystal is the enthalpy of:



12. Heat of formation (ΔH°f) for CO₂ is:



13. 2H₂O → ΔH = +285.5 kJ/mol What will be the enthalpy change in the equation?



14. Combustion of graphite to form CO₂ can be done by two ways. Reactions are: C + O₂ → CO₂ ΔH = –284 kJ/mol C + ½O₂ → CO ΔH = –110 kJ/mol CO + ½O₂ → CO₂ ΔH = –676 kJ/mol What will be enthalpy of formation of CO?



15. Reaction of water with quick lime results in the rise of temperature of the system. Using the concept of energy change, indicate the nature of the reaction:



16. The equation that represents enthalpy of atomization of hydrogen is:



17. Standard enthalpy of combustion of graphite at 25°C is –395.41 kJ/mol and that of diamond is –393.5 kJ/mol. The enthalpy change of graphite to diamond is:



18. ½ H2 (g) →H(g) ΔH =218 kJ/mol in this reaction ΔH will be called



19. Mg + ½O₂ → MgO(g) ΔH = –692 kJ/mol at STP. Enthalpy of above reaction will be called:



20. Which one of the following enthalpy changes is always exothermic?



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