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Which one of the following aqueous solutions will exhibit highest boiling point?

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Which one of the following aqueous solutions will exhibit highest boiling point?
(a) 0.01M Na2SO4
(b) 0.01M KNO3
(c) 0.015M urea
(d) 0.015M glucose.

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(a) : Elevation in boiling point is a colligative property which depends upon the number of solute particles.
Greater the number of solute particles in a solution, higher the extent of elevation in boiling point.
Na2SO4 → 2Na+ + SO42–

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