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Among the following aqueous solutions, which one will have the greatest boiling point?

1. 0.015 M urea solution
2. 0.010 M potassium nitrate solution
3. 0.010 M sodium sulfate solution
4. 0.015 M glucose solution

Correct answer: 0.010 M sodium sulfate solution

Solution

Boiling point elevation depends on i x c. Values: 0.015 urea -> 0.015; 0.010 KNO3 (i=2) -> 0.020; 0.010 Na2SO4 (i=3) -> 0.030; 0.015 glucose -> 0.015. Na2SO4 has the largest effective particle concentration, so it gives the greatest boiling point.

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