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Class 12 · Chemistry
→When 10 g of a non-electrolyte solute is dissolved in 500 g of water, the depression in freezing point is ΔT_f = 0.186 K. Taking K_f = 1.86 K kg mol⁻¹, what is the molar mass of the solute?
Class 12 · Chemistry
→Which of the following properties depends on the number of solute particles present in a solution rather than on their chemical nature?
Class 12 · Chemistry
→In a solution, association of solute molecules makes the van’t Hoff factor i less than 1. What will be the effect on ΔTf?
Class 12 · Chemistry
→In which of the following solutions will the molar mass observed from colligative properties be greater than the actual molar mass because of association of solute molecules?
Class 12 · Chemistry
→If the mole fraction of solute is doubled and the solution remains dilute, what happens to the relative lowering of vapour pressure?
Class 12 · Chemistry
→Why should a solution be very dilute when determining molar mass by the osmotic pressure method?
Class 12 · Chemistry
→For an associated solute, the van’t Hoff factor is i = 0.75. How will the colligative effect compare with that of a normal non-dissociated solute at the same concentration?
Class 12 · Chemistry
→A solution has a freezing-point depression of 0.93 K. If Kf = 1.86 K kg mol⁻¹ and the solute is non-dissociated, what is the molality?
Class 12 · Chemistry
→Which solution will have the highest osmotic pressure at the same temperature if all solutions are 0.1 M and dissociation is complete?
Class 12 · Chemistry
→If a 0.5 m non-dissociated solute produces a boiling-point elevation of 0.26 K, what is the value of Kb?
Class 12 · Chemistry
→When 5 g of a solute is dissolved in 250 g of solvent, the molality is 0.2 m. What is the molar mass of the solute?
Class 12 · Chemistry
→Why does the freezing point of a solution decrease when a non-volatile solute is added?
Class 12 · Chemistry
→If a 0.1 m BaCl₂ solution has 80% dissociation, what is the value of the van’t Hoff factor i?
Class 12 · Chemistry
→Which of the following statements about osmotic pressure is correct?
Class 12 · Chemistry
→What is the main reason for the elevation of the boiling point of a solution?
Class 12 · Chemistry
→Assuming complete dissociation, which of the following aqueous solutions of equal molality will have the lowest freezing point?
Class 12 · Chemistry
→What happens if a blood cell is placed in a highly concentrated salt solution?
Class 12 · Chemistry
→A 0.1 m solution has ΔTb = 0.052 K. If Kb = 0.52 K kg mol⁻¹ for the solvent, what is the van’t Hoff factor i?
Class 12 · Chemistry
→If the molar mass obtained from freezing-point depression is higher than the true value, what may be happening in the solution?
Class 12 · Chemistry
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