Question

Assertion :The solubility of must salts in water increases with rise of temperature. Reason: For most of the ionic compounds, ${\Delta }_{sol}{H}^0$ is positive and the dissolution process is endothermic.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

Solubility of the most of the salt rises with increase in temperature.This is because with increase in temperature, kinetic energy of the molecules increases and the solvent molecules break apart the solute molecules that are held together by intermolecular attractions more effectively. Also for most of the ionic compounds, change in enthalpy is positive and hence the dissolution process is endothermic. For endothermic reaction, increase in temperature leads the reaction to forward reaction.