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Molar Mass Determination

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

ChemistryIf \(2\,\mathrm{g}\) of solute is present in a \(1\,\mathrm{L}\) solution and its molar mass determined by osmotic pressure is \(100\,\mathrm{g\,mol^{-1}}\), how many moles of solute are present?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIf the osmotic pressure of one solution is greater than that of another at the same temperature, and both solutes are non-dissociating, what can be concluded about the first solution?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIn the freezing-point-depression method, \(K_f=1.86\,\mathrm{K\,kg\,mol^{-1}}\), \(\Delta T_f=0.93\,\mathrm{K}\), and the solute is non-dissociating. What is the molality?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryUnder which condition is the molar mass obtained from a colligative-property measurement most reliable?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 17Medium ChemistryWhen calculating molar mass by the osmotic-pressure method at \(27^\circ\mathrm{C}\), what temperature value should be used?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryWhat happens if \(w_A\) and \(w_B\) are interchanged in a molar-mass determination formula?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryA solution has 3 g of solute dissolved in 250 g of solvent. If K_b = 0.5 K kg mol⁻¹ and ΔT_b = 0.30 K, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIf the K_b value of the wrong solvent is used while calculating molar mass from boiling-point elevation, what will happen?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIf the mass of a non-dissociating solute remains the same but the mass of the solvent is doubled, what happens to the freezing-point depression?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryWhy can an error occur in molar mass determination if the solution is too concentrated?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIn the freezing-point depression method, what problem occurs if the total mass of the solution is mistakenly used as the mass of the solvent?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryFor a non-dissociating solute, Kb = 0.52 K kg mol⁻¹ and the molality is 0.5 mol kg⁻¹. What is the elevation in boiling point?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIf 1 g of solute is dissolved in 200 g of solvent and its molar mass is 50 g mol⁻¹, what is the molality of the solution?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIn the osmotic-pressure method, 0.01 mol of a non-electrolyte solute is present in 1 L of solution. At 300 K, if R = 0.082 L atm K⁻¹ mol⁻¹, what is the osmotic pressure?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryWhich of the following colligative properties can be used to determine the molar mass of a solute?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 17Easy ChemistryWhile determining molar mass from lowering of vapour pressure, the mole fraction of the solute is related to which quantity?Class 12Chapter 01: Solutions4: Vapour PressureLevel 17Easy ChemistryIn the boiling-point elevation method, 2 g of a non-electrolyte solute is dissolved in 100 g of solvent. If K_b = 0.5 K kg mol⁻¹ and the elevation in boiling point, ΔT_b, is 0.25 K, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryWhich method is safest for determining the molar mass of large biomolecules because it does not require a large temperature change?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Easy ChemistryIn the freezing-point depression method, 1.0 g of solute is dissolved in 100 g of solvent. If Kf = 2.0 K kg mol⁻¹ and ΔTf = 0.20 K, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium ChemistryIn the boiling-point elevation method, if the temperature difference is measured smaller than its actual value, how will the calculated molar mass generally compare with the actual value?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17Medium