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Chapter 01 Solutions

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

ChemistryUnder which condition is the observed molar mass of a solute greater than its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryIf 25% of the molecules of a substance form dimers, what will be its van’t Hoff factor i?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryThe observed molar mass of a substance is 80 g mol⁻¹ and its van’t Hoff factor is 0.8. What is the normal molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIn molar-mass determination using colligative properties, for which type of solute is the observed molar mass generally lower than its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryFor determining the molar mass of a solute in dilute solutions, the osmotic-pressure method is especially suitable for which type of substances?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryIf vapour-pressure lowering calculation gives 0.2 mol of solute and the solute mass is 18 g, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryIf the relative lowering of vapour pressure is 0.02 and the number of moles of solvent is 9.8, approximately how many moles of solute are present in the dilute solution?Class 12Chapter 01: Solutions4: Vapour PressureLevel 18Medium ChemistryIf a 0.2 m nonelectrolyte solution has Kf = 1.86 K kg mol⁻¹, what is the depression in freezing point?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 18Easy ChemistryA solution contains 2 g of solute in 100 g of solvent. If the molar mass of the solute is 100 g mol⁻¹, what is the molality?Class 12Chapter 01: Solutions2: Concentration MetricsLevel 18Easy ChemistryIn the freezing-point-depression method, if the solute mass is doubled while the solvent mass remains constant, what happens to ΔT_f for a nonelectrolyte?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Easy ChemistryIf 0.5 g of a polymer gives an osmotic pressure of 0.082 atm in 250 mL of solution at 300 K, what is its molar mass? Use R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryIf a solution has a van’t Hoff factor i = 1.5 and the normal molar mass is 75 g mol⁻¹, what is the observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryThe observed molar mass of a solute in a solution is higher than its normal molar mass. What is the simplest possible reason?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryThe observed molar mass of a solute in a solution is lower than its normal molar mass. Which statement best explains this observation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryA 0.02 mol sample of a substance has a mass of 3.6 g. What is the molar mass of the substance?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Easy ChemistryIf 0.9 g of a substance produces an osmotic pressure of 0.246 atm in 0.3 L of solution at 300 K, what is its molar mass? Take R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 2.4 g of a substance is dissolved in 200 g of solvent, the boiling point rises by 0.104 K. If Kb = 0.52 K kg mol⁻¹, what is the molar mass of the substance?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryWhen 4.5 g of a nonelectrolyte is dissolved in 250 g of water, the freezing-point depression is 0.372 K. If Kf = 1.86 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium ChemistryA salt AB is 60% dissociated in solution. If its normal molar mass is 100 g mol⁻¹, what is its observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryThe normal molar mass of a solute is 90 g mol⁻¹, and 50% of its molecules form dimers. What will be the observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium