Which of the following solution will have
Correct answer: A. 1 molar solution of urea
- A. 1 molar solution of urea
- B. 1 molar solution of glucose
- C. 1 molar solution of sodium chloride
- D. 1 molar solution of magnesium chloride
Explanation
The correct answer is the 1 molar solution of urea. Urea is a non-electrolyte, meaning it does not dissociate into ions in solution. This makes it contribute to solution properties as a single particle per molecule, unlike electrolytes that increase the number of particles by dissociating into ions.Glucose, similar to urea, is a non-electrolyte and does not dissociate, but the question may be looking for the option that contrasts with electrolytes like NaCl and MgCl2. Sodium chloride dissociates into two ions, and magnesium chloride dissociates into three ions, increasing their effective concentration in terms of particle number, thus affecting colligative properties differently.
This question appeared on the ETEA MDCAT 2016 paper, which you can sit online with every answer explained.
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About Colligative Properties
Colligative properties depend on the number of dissolved particles rather than their chemical identity. The topic covers relative lowering of vapour pressure, elevation of boiling point, depression of freezing point and osmotic pressure, including electrolyte dissociation, the van’t Hoff factor and molar-mass calculations.
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