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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।

ChemistryWhen 4 g of a solute is dissolved in 500 g of water, the freezing-point depression is 0.186 K. If the solute is an AB-type solute that dissociates by 50%, what is its true molar mass? Take Kf for water as 1.86 K kg mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16HardChemistryThe true molar mass of a solute is \(180\,\mathrm{g\,mol^{-1}}\), but a colligative-property measurement gives an apparent molar mass of \(90\,\mathrm{g\,mol^{-1}}\). What is the value of the van’t Hoff factor \(i\)?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17MediumChemistryA \(1\,\mathrm{L}\) solution is prepared from \(6\,\mathrm{g}\) of solute. Its osmotic pressure at \(300\,\mathrm{K}\) is \(1.23\,\mathrm{atm}\). The solute is non-dissociating. What is its molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA solution of volume \(500\,\mathrm{mL}\) is prepared using \(1.5\,\mathrm{g}\) of solute. Its osmotic pressure at \(300\,\mathrm{K}\) is \(0.615\,\mathrm{atm}\). If \(R=0.082\,\mathrm{L\,atm\,mol^{-1}\,K^{-1}}\), what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryWhen \(5\,\mathrm{g}\) of a non-dissociating solute is dissolved in \(250\,\mathrm{g}\) of solvent, the boiling point rises by \(0.104\,\mathrm{K}\). If \(K_b=0.52\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryWhen \(2.4\,\mathrm{g}\) of a non-dissociating solute is dissolved in \(200\,\mathrm{g}\) of water, the freezing point decreases by \(0.372\,\mathrm{K}\). If \(K_f=1.86\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA sample has a normal molar mass of \(98\,\mathrm{g\,mol^{-1}}\), but its experimentally determined molar mass is \(49\,\mathrm{g\,mol^{-1}}\). Which statement best explains this result?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17MediumChemistryIf \(0.10\,\mathrm{mol}\) of solute has a mass of \(9.0\,\mathrm{g}\), and the same amount of solute is obtained from a colligative-property measurement, what is its molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17EasyChemistryA solution has relative lowering of vapour pressure \(0.02\). If the total number of moles in the solution is \(5.0\), how many moles of solute are present?Class 12Chapter 01: Solutions4: Vapour PressureLevel 17MediumChemistryWhy is the vapour-pressure method considered comparatively difficult for molar mass determination?Class 12Chapter 01: Solutions4: Vapour PressureLevel 17MediumChemistryIf \(2.0\,\mathrm{g}\) of solute in \(1.0\,\mathrm{L}\) of solution gives an osmotic pressure of \(0.492\,\mathrm{atm}\) at \(300\,\mathrm{K}\), what is the molar mass? Use \(R=0.082\,\mathrm{L\,atm\,K^{-1}\,mol^{-1}}\).Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryWhen \(4.0\,\mathrm{g}\) of a solute is dissolved in \(400\,\mathrm{g}\) of solvent, \(\Delta T_f=0.50\,\mathrm{K}\). If \(K_f=5.0\,\mathrm{K\,kg\,mol^{-1}}\), what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryIn a molar mass experiment, \(\Delta T_b\) is found to be lower than expected. If the solute is an acid in an organic solvent, what is the probable reason?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 17MediumChemistryIn a molar mass determination experiment, \(\Delta T_f\) is found to be greater than expected. If the solute is an electrolyte, what is the most suitable reason?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 17MediumChemistryA solution has osmotic pressure \(1.23\,\mathrm{atm}\) at \(300\,\mathrm{K}\). If the concentration of the same solution is halved while the temperature remains \(300\,\mathrm{K}\), what will be the new osmotic pressure?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 17EasyChemistryIf a solution has van’t Hoff factor \(i=0.8\) and normal molar mass \(200\,\mathrm{g\,mol^{-1}}\), what will be the observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryIf a solute forms trimers to the extent of 50% during molar-mass determination, what will be the value of the van’t Hoff factor i?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryWhich colligative property is most suitable for determining the molar mass of macromolecules such as proteins, which have very high molar masses?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryA solute has a van’t Hoff factor i = 3 and an observed molar mass of 40 g mol⁻¹. What is its normal molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17MediumChemistryA solution contains 1.8 g of solute dissolved in 90 g of solvent. If Kf = 1.5 K kg mol⁻¹ and ΔTf = 0.30 K, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium