Question:
For which of the following solids does solubility decrease with an increase in temperature?
For which of the following solids does solubility decrease with an increase in temperature?
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Solubility falls with temperature when dissolution is exothermic; sodium sulphate above about 32 C is such a case.
Updated On: Nov 12, 2026
- Potassium nitrate
- Sodium nitrate
- Sodium sulphate.
- Potassium chloride
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The Correct Option is C
Solution and Explanation
Step 1: Understanding the Concept
By Le Chatelier's principle, if dissolving absorbs heat (endothermic), solubility rises with temperature; if it releases heat (exothermic), solubility falls.
Step 2: Apply to the options
Potassium nitrate, sodium nitrate and potassium chloride dissolve endothermically, so their solubility increases on heating.
Step 3: Sodium sulphate
Above about 32 C it exists as the anhydrous salt and its dissolution is exothermic.
Hence its solubility decreases as temperature rises.
Final Answer:
Sodium sulphate shows decreasing solubility with rising temperature. \[ \boxed{\text{(C) }\text{Sodium sulphate}} \]
By Le Chatelier's principle, if dissolving absorbs heat (endothermic), solubility rises with temperature; if it releases heat (exothermic), solubility falls.
Step 2: Apply to the options
Potassium nitrate, sodium nitrate and potassium chloride dissolve endothermically, so their solubility increases on heating.
Step 3: Sodium sulphate
Above about 32 C it exists as the anhydrous salt and its dissolution is exothermic.
Hence its solubility decreases as temperature rises.
Final Answer:
Sodium sulphate shows decreasing solubility with rising temperature. \[ \boxed{\text{(C) }\text{Sodium sulphate}} \]
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