Question:
The correct order of boiling points of the given aqueous solutions is
The correct order of boiling points of the given aqueous solutions is
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Colligative properties depend on the number of solute particles. Strong electrolytes dissociate completely, producing more particles than weak electrolytes or non-electrolytes.
Updated On: Jan 10, 2025
- 1 N KNO3>1 N NaCl>1 N CH3COOH>1 N sucrose
- 1 N KNO3 = 1 N NaCl>1 N CH3COOH>1 N sucrose
- Same for all
- 1 N KNO3 = 1 N NaCl = 1 N CH3COOH>1 N sucrose
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The Correct Option is B
Solution and Explanation
The boiling point elevation is a colligative property, which depends on the number of solute particles in the solution:
- KNO3: Strong electrolyte, dissociates into 2 ions (K+ and NO−3).
- NaCl: Strong electrolyte, dissociates into 2 ions (Na+ and Cl−).
- CH3COOH: Weak electrolyte, partially dissociates into CH3COO− and H+ ions.
- Sucrose: Non-electrolyte, does not dissociate.
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Since strong electrolytes like KNO3 and NaCl produce more particles in solution compared to weak electrolytes like CH3COOH and non-electrolytes like sucrose, the order of boiling points is: 1 N KNO3 = 1 N NaCl>1 N CH3COOH>1 N sucrose.
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