Which of the following colligative properties can be used to determine the molar mass of a solute?
Answer and explanation
Correct answer: Relative lowering of vapour pressure
Relative lowering of vapour pressure is a colligative property because, for a dilute solution with a non-volatile solute, it depends on the number of solute particles rather than their chemical identity. The measured lowering gives the solute mole fraction; with known solute and solvent masses, the number of moles and hence molar mass can be calculated. The other choices are not colligative properties. Therefore, A is correct.
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What is the correct answer to this question?
Relative lowering of vapour pressure
Why is this the correct answer?
Relative lowering of vapour pressure is a colligative property because, for a dilute solution with a non-volatile solute, it depends on the number of solute particles rather than their chemical identity. The measured lowering gives the solute mole fraction; with known solute and solvent masses, the number of moles and hence molar mass can be calculated. The other choices are not colligative properties. Therefore, A is correct.
Which subject and chapter does this question cover?
This is a Class 12 Chemistry question. Chapter: Chapter 01: Solutions. Topic: 5: Colligative Properties.
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