CBSE Class 12 · 2002 · All India Compartment · SolutionsVery Short Answer

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Solution A is obtained by dissolving 1 g of urea in 100 g of water and solution B is obtained by dissolving 1 g of glucose in 100 g of water. Which solution will have a higher boiling point and why?

Solution

Elevation of boiling point depends on the number of solute particles.
Moles of urea

= \frac{1}{60}

mol; moles of glucose

= \frac{1}{180}

mol.
For the same mass of water, solution A (urea) has the larger molality, hence the larger

Δ T_{b}

and the higher boiling point.

CBSE Class 12 Board · 2002 · All India Compartment · Subjective

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