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Colligative Properties

Class 12 Chemistry के इस tag से जुड़े questions। हर question के साथ chapter, topic, level और difficulty दी गई है।

ChemistryIn molar mass determination, if the observed van’t Hoff factor is i < 1, what is the most suitable conclusion?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryA 1 L solution is prepared from 3.6 g of a solute. At 300 K, its osmotic pressure is 0.369 atm. If the solute undergoes 25% dimerization, what is its approximate true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryIf a solute has i = 0.4 and a true molar mass of 80 g mol⁻¹, what will be the observed molar mass determined by a colligative method?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryA solute forms trimers to the extent of 60%. If its true molar mass is 180 g mol⁻¹, what will be its observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryWhen 4.5 g of a solute is dissolved in 300 g of water, the depression in freezing point is 0.837 K. If i = 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryIf K_b = 0.52 K kg mol⁻¹, the solute mass is 3 g, the solvent mass is 250 g, the molar mass of the solute is 60 g mol⁻¹, and the van’t Hoff factor i = 2, what is the elevation in boiling point, ΔT_b?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIf K_f = 1.86 K kg mol⁻¹, the solute mass is 4 g, the solvent mass is 200 g, the molar mass of the solute is 100 g mol⁻¹, and the van’t Hoff factor i = 1.5, what is the depression in freezing point, ΔT_f?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryA 300 mL solution is prepared using 1.8 g of solute. At 300 K, its osmotic pressure is 0.492 atm. If i = 1.2, what is the true molar mass? Use R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryIf the true molar mass of a solute is 240 g mol⁻¹ and the colligative method gives an observed molar mass of 160 g mol⁻¹, what are i and the probable behaviour of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryWhen 5 g of a solute is dissolved in 500 g of solvent, the elevation in boiling point is 0.078 K. If Kb = 0.52 K kg mol⁻¹ and i = 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryWhen 3 g of a solute is dissolved in 250 g of water, the depression in freezing point is 0.465 K. If the van’t Hoff factor is 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryA solution contains 2.4 g of solute in 400 mL of solution. Its osmotic pressure at 300 K is 0.492 atm. If i = 0.8, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryIn the vapour-pressure method, p⁰ = 120 mmHg and p = 114 mmHg. If 3 g of solute is dissolved in 54 g of water, what is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryWhen 1.8 g of a solute is dissolved in 150 g of water, the depression in freezing point is 0.279 K. If i = 0.75, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryWhen 2.4 g of a solute is dissolved in 200 g of solvent, the elevation in boiling point is 0.156 K. If Kb = 0.52 K kg mol⁻¹ and i = 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard ChemistryA 500 mL solution is prepared using 2 g of solute. At 300 K, its osmotic pressure is 0.615 atm. If i = 1.25, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryA solution has an actual molarity of 0.03 M and a van’t Hoff factor of 1.8. If the true molar mass of the solute is 180 g mol⁻¹, what observed molar mass would be obtained by a colligative-property method?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryWhen 4.8 g of a solute is dissolved in 400 g of solvent, the elevation in boiling point is 0.156 K. If Kb = 0.52 K kg mol⁻¹ and i = 0.75, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryWhen 2.5 g of a solute is dissolved in 500 g of water, the depression in freezing point is 0.2325 K. If the van’t Hoff factor is 1.25, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryA 0.04 M solution has an osmotic pressure of 1.476 atm at 300 K. If the true molar mass is 150 g mol⁻¹, what will be the observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Hard