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Class 12 · Chemistry · Medium
→An AB₂ salt has i = 2.2. What is its degree of dissociation?
Class 12 · Chemistry · Hard
→The apparent molar mass of a solute is 0.40 times its true molar mass. If it dissociates into three ions, what is the degree of dissociation?
Class 12 · Chemistry · Medium
→If K_b = 0.52 K kg mol⁻¹, m = 0.50 mol kg⁻¹, and observed ΔT_b = 0.39 K, what is i?
Class 12 · Chemistry · Hard
→A 0.01 M solution has an osmotic pressure of 0.369 atm at 27°C. Taking R = 0.082 L atm mol⁻¹ K⁻¹, what is the approximate value of i?
Class 12 · Chemistry · Easy
→For a solute, elevation in boiling point is lower than the normal expected value. What is the most likely reason?
Class 12 · Chemistry · Medium
→For a solution with K_f = 2.0 K kg mol⁻¹, molality 0.20 mol kg⁻¹, and observed ΔT_f = 0.60 K, what is i?
Class 12 · Chemistry · Hard
→A solute has i = 0.40 and forms only trimers. What is the approximate degree of association?
Class 12 · Chemistry · Medium
→A solute forms trimers and 60% of its molecules become associated. What is the van’t Hoff factor?
Class 12 · Chemistry · Easy
→If the osmotic pressure of a solution is 1.8 times the normally expected value, what is its van’t Hoff factor?
Class 12 · Chemistry · Hard
→Two solutions have the same molality. In the first, the solute completely dimerises; in the second, it completely dissociates into two ions. What is the ratio of their freezing-point depressions?
Class 12 · Chemistry · Medium
→A weak electrolyte XY has i = 1.25 and gives two ions. What is its degree of dissociation?
Class 12 · Chemistry · Medium
→A solute has i = 0.75. If it only forms dimers, what is the degree of association?
Class 12 · Chemistry · Hard
→AB₃ undergoes 40% dissociation into A³⁺ and three B⁻ ions. What fraction of the true molar mass is the apparent molar mass?
Class 12 · Chemistry · Medium
→The apparent molar mass of a solute is double its true molar mass. What is the most suitable explanation?
Class 12 · Chemistry · Medium
→A salt MX₂ is 75% dissociated. Since it gives three ions on complete dissociation, what is its van’t Hoff factor?
Class 12 · Chemistry · Hard
→An acid dimerises in benzene. The expected freezing-point depression is 0.50 K, but the observed value is 0.30 K. What is the approximate degree of association?
Class 12 · Chemistry · Medium
→A solute has true molar mass 120 g mol⁻¹ and apparent molar mass 80 g mol⁻¹. What is its van’t Hoff factor?
Class 12 · Chemistry · Medium
→An electrolyte AB is 60% dissociated into A⁺ and B⁻. What is its van’t Hoff factor?
Class 12 · Chemistry · Medium
→A solute completely dimerises in solution. If its true molar mass is M, what apparent molar mass is obtained from freezing-point depression?
Class 12 · Chemistry · Medium
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