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

Thermochemistry | First Year Chemistry Past Papers MCQs

7 of 38 questions (Page 4 of 6)

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22 The SI unit of enthalpy is:
Correct Answer: A
Explanation: Enthalpy, like energy, is measured in joules (J).
23 Which of the following is NOT a state function?
Correct Answer: C
Explanation: Work depends on the path taken (not a state function).
24 For an exothermic reaction, the sign of ΔH is:
Correct Answer: B
Explanation: Exothermic: ΔH < 0 (system releases heat).
25 The heat required to raise the temperature of 1 g of water by 1°C is called:
Correct Answer: C
Explanation: 1 calorie = heat needed to raise 1 g water by 1°C (from 14.5°C to 15.5°C).
26 The enthalpy change for the formation of 1 mole of water from H₂ and O₂ is:
Correct Answer: B
Explanation: ΔH°f for H₂O(l) = -285.8 kJ/mol (for H₂O(g) = -241.8 kJ/mol).
27 The process with ΔH = 0 is:
Correct Answer: C
Explanation: Ideal gas mixing has ΔH = 0 (no interactions between molecules).
28 The heat of neutralization of strong acid and strong base is always about:
Correct Answer: A
Explanation: Strong acid-base neutralization: H⁺ + OH⁻ → H₂O releases -57.3 kJ/mol.
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