Question:
In which of the following salts, the solubility increases appreciably with increase in temperature?
In which of the following salts, the solubility increases appreciably with increase in temperature?
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For alkali halides, the salt with the smallest cation and largest anion (NaBr) often shows the greatest temperature sensitivity due to hydration energy effects.
Updated On: Jun 4, 2026
- KBr
- NaBr
- NaCl
- KCl
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
We need to identify the salt whose solubility in water increases significantly with rising temperature.
Step 2: Key Formula or Approach:
For most ionic compounds, solubility increases with temperature, but the extent varies. Salts with highly endothermic dissolution show a sharp increase. Among alkali halides, NaBr shows a notable increase.
Step 3: Detailed Explanation:
- KBr, NaCl, KCl show moderate increases. - NaBr has a more endothermic dissolution enthalpy, so its solubility increases appreciably with temperature. From standard data: NaBr solubility at 0°C ~ 80 g/100 mL, at 100°C ~ 120 g/100 mL – a significant rise.
Step 4: Final Answer:
The salt is NaBr, option (B).
We need to identify the salt whose solubility in water increases significantly with rising temperature.
Step 2: Key Formula or Approach:
For most ionic compounds, solubility increases with temperature, but the extent varies. Salts with highly endothermic dissolution show a sharp increase. Among alkali halides, NaBr shows a notable increase.
Step 3: Detailed Explanation:
- KBr, NaCl, KCl show moderate increases. - NaBr has a more endothermic dissolution enthalpy, so its solubility increases appreciably with temperature. From standard data: NaBr solubility at 0°C ~ 80 g/100 mL, at 100°C ~ 120 g/100 mL – a significant rise.
Step 4: Final Answer:
The salt is NaBr, option (B).
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