Which of the following solution has the highest boiling point ?
Correct answer: A. 5.85% NaCl Solution
- A. 5.85% NaCl Solution
- B. 18.0 % glucose solution
- C. 6.0 % urea solution
- D. All have same boiling point
Explanation
Boiling-point elevation depends on the number of dissolved particles. For 100 g of solution, NaCl gives about 0.100 mol ÷ 0.09415 kg = 1.06 mol kg-1, and its van't Hoff factor of about 2 gives roughly 2.12 effective mol kg-1, higher than glucose and urea, which do not ionise. The likely trap is glucose, because its percentage is larger, but concentration of particles rather than mass percentage alone matters.
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Liquid behavior depends on intermolecular forces, which produce surface tension, viscosity, capillary action and a definite volume without a fixed shape. The topic also covers vapor pressure, evaporation, boiling point and the effect of temperature and external pressure, while distinguishing evaporation at the surface from boiling throughout the liquid.
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