Which of the following salts should cause maximum cooling when 1 mole of it is dissolved in the same volume…

Which of the following salts should cause maximum cooling when 1 mole of it is dissolved in the same volume of water ?
  1. $\mathrm{NaCl} ; \Delta \mathrm{H}^{\mathrm{o}}=5.35 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  2. $\mathrm{KNO}_{3} ; \Delta \mathrm{H}^{\circ}=53.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  3. $\mathrm{KOH} ; \Delta \mathrm{H}^{\circ}=-56.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$
  4. $\mathrm{HBr} ; \Delta \mathrm{H}^{\mathrm{o}}=-83.3 \mathrm{~kJ} \mathrm{~mol}^{-1}$

Solution

Dissolution of $\mathrm{KNO}_{3}$ is endothermic, hence heat is absorbed and cooling is observed. .

Asked in: JEE-TOPICTESTS-CHEMISTRY

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