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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।

ChemistryAn A₂B₃-type solute has a van’t Hoff factor i = 3. If complete dissociation produces five particles, what is the degree of dissociation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 0.9 g of a solute is dissolved in 100 g of water, the depression in freezing point is 0.279 K. If Kf = 1.86 K kg mol⁻¹ and the solute has i = 0.75 because of dimer formation, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 1.2 g of a solute is dissolved in 150 g of solvent, the elevation in boiling point is 0.104 K. If Kb = 0.52 K kg mol⁻¹ and the solute has a van’t Hoff factor i = 2, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryIf the observed molar mass of a solute is 1.25 times its true molar mass, what are the van’t Hoff factor (i) and the type of behaviour shown by the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryIf the observed molar mass of a solute is 0.625 times its true molar mass, what are the van’t Hoff factor (i) and the type of behaviour shown by the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA 250 mL solution is prepared from 3 g of solute. At 300 K, its osmotic pressure is 1.845 atm. If i = 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryWhen 2.8 g of a solute is dissolved in 200 g of water, the depression in freezing point is 0.651 K. If the solute is AB-type and 50% dissociated, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 2 g of a non-volatile solute is dissolved in 90 g of water, the relative lowering of vapour pressure is 0.02. What is the approximate molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryThe observed molar mass of an A₂B-type solute is 5/9 of its true molar mass. What is the degree of dissociation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryAn AB-type solute is 75% dissociated. If its observed molar mass is 80 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA substance forms trimers and is 30% associated. If its true molar mass is 90 g mol⁻¹, what will be the approximate observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA substance undergoes 40% dimerization. If its observed molar mass determined by a colligative method is 150 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryA 750 mL sample of a 0.02 M solution contains 3.0 g of solute. If i = 1.25 and the given molarity is the actual solute molarity, what is the observed molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 6 g of a solute is dissolved in 300 g of solvent, the elevation in boiling point is 0.156 K. If K_b = 0.52 K kg mol⁻¹ and i = 0.75, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryWhen 4 g of a solute is dissolved in 500 g of water, the depression in freezing point is 0.279 K. If the van’t Hoff factor is 1.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryA student mistakenly takes 250 g solvent as 250 kg. In the freezing-point method, how will the calculated molar mass compare with the correct value?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Medium ChemistryIn the vapour-pressure method, the mole fraction of solute is found to be 0.04. If 1.8 g solute was dissolved in 18 g water, what is the approximate molar mass of the solute?Class 12Chapter 01: Solutions4: Vapour PressureLevel 16Hard ChemistryA 300 mL solution is prepared using 2.4 g solute. Its osmotic pressure at 300 K is 0.492 atm. If the solute forms dimers and i = 0.5, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryWhen 3 g of an AB2-type solute is dissolved in 250 g water, ΔTf = 0.558 K. If dissociation is 50% and Kf = 1.86 K kg mol−1, what is the true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16Hard ChemistryIn molar mass determination, a student treats 100 g solvent as 100 kg while calculating molality. What will happen to the result?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18Medium