Chemical Thermodynamics Question 385

Question: Which of the following salts should cause maximum cooling when 1 mole of it is dissolved in the same volume of water-

Options:

A) $ NaCl;\Delta {{H}^{{}^\circ }}=5.35kJmo{{l}^{-1}} $

B) $ KNO_3;\Delta {{H}^{{}^\circ }}=53.5kJmo{{l}^{-1}} $

C) $ KOH;\Delta {{H}^{{}^\circ }}=-56.0kJmo{{l}^{-1}} $

D) $ HBr;\Delta {{H}^{{}^\circ }}=-83.3kJmo{{l}^{-1}} $

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Answer:

Correct Answer: B

Solution:

  • Dissolution of $ KNO_3 $ is endothermic, hence heat is absorbed and cooling is observed.


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