Thermochemistry | First Year Chemistry Past Papers MCQs | mosaicbro.com

Thermochemistry | First Year Chemistry Past Papers MCQs

3 of 38 questions (Page 6 of 6)

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36 For an endothermic reaction, the sign of ΔH is:
Correct Answer: A
Explanation: Endothermic: ΔH > 0 (system absorbs heat).
37 The enthalpy change when 1 mole of a substance is vaporized at its boiling point is called:
Correct Answer: A
Explanation: Heat of vaporization (ΔH_vap) is the energy for liquid → gas transition.
38 The process with ΔH > 0 and ΔS > 0 is spontaneous at:
Correct Answer: B
Explanation: When ΔH > 0 and ΔS > 0, ΔG = ΔH - TΔS < 0 at high T (spontaneous).
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