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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।

ChemistryIn the boiling-point-elevation method for determining the molar mass of an unknown solute, which quantity is measured directly?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18EasyChemistryA solution has higher osmotic pressure than another solution at the same temperature. If both contain the same mass of solute, what is the most suitable conclusion about the first solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryWhich is the correct relation for molar-mass determination using relative lowering of vapour pressure?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryIf 0.5 g of a solute in 250 mL solution gives an osmotic pressure of 0.82 atm at 27 °C, find its molar mass. Use R = 0.082 L atm K⁻¹ mol⁻¹.Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryFor molar-mass determination of a non-electrolyte solute, which statement is correct?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18EasyChemistryWhich method often needs very precise measurement because the temperature change is very small?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryWhich assumption is necessary while determining molar mass by relative lowering of vapour pressure?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryIn the osmotic-pressure method, using M = wRT/(πV), what does V represent?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18EasyChemistry1.5 g of a non-volatile solute dissolved in 50 g of benzene raises its boiling point by 0.78 K. If Kb for benzene is 2.6 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryIf 2 g of a solute dissolved in 100 g of water lowers the freezing point by 0.186 K, and Kf for water is 1.86 K kg mol⁻¹, what is the molar mass of the solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryWhy is the osmotic-pressure method considered especially useful for determining the molar mass of biomolecules?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryEqual masses of two non-volatile solutes are dissolved in equal masses of the same solvent. If the first solution shows a greater freezing-point depression, what can be concluded about the first solute?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryIn the freezing-point depression method, in which situation will the calculated molar mass of a solute be higher than its true value?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryThe molar mass of a solute determined by osmotic pressure is lower than its normal value. What is the most suitable reason?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryThe molar mass of an unknown non-volatile solute is determined using boiling-point elevation. If the solvent mass is halved while the solute mass remains unchanged, what happens to the elevation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 18MediumChemistryIn 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 18MediumChemistryA 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 17HardChemistryAn AB₂ solute has a van’t Hoff factor of 2.6, and its true molar mass is 156 g mol⁻¹. What are its observed molar mass and degree of dissociation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryWhen 0.5 g of a solute is dissolved in 250 g of water, the freezing-point depression is 0.0186 K. If i = 1 and Kf for water is 1.86 K kg mol⁻¹, what is the molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17HardChemistryIf 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