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Abnormal Molar Mass

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

ChemistryThe molar mass obtained by the boiling-point elevation method is higher than the true molar mass. What is the most common reason?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 16MediumChemistryThe molar mass of a solute determined by the freezing-point depression method is much lower than its true molar mass. Which reason is most probable?Class 12Chapter 01: Solutions5: Colligative PropertiesLevel 16MediumChemistryA substance forms trimers. If its van’t Hoff factor is i = 0.6, what is the degree of association?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA solute forms dimers. Its true molar mass is 60 g mol⁻¹, while its observed molar mass is 80 g mol⁻¹. What is the degree of association?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16MediumChemistryIf the observed molar mass of an AB-type solute is 5/8 of its true molar mass, what is the degree of dissociation?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 16MediumChemistryA solute has a true molar mass of \(120\,\mathrm{g\,mol^{-1}}\), but its observed molar mass is \(240\,\mathrm{g\,mol^{-1}}\). What is the most suitable conclusion?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17MediumChemistryThe 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 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 a solution has van’t Hoff factor \(i=2\), but a student assumes \(i=1\) while calculating molar mass, what happens to the calculated molar mass of the electrolyte?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 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 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 17HardChemistryA 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 17MediumChemistryIf the observed molar mass of a solute is greater than its actual molar mass, which phenomenon does this generally indicate?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17EasyChemistryDuring molar-mass determination by the elevation-in-boiling-point method, for which solute is the observed molar mass likely to be greater than its true molar mass?Class 12Chapter 01: Solutions6: Molar Mass DeterminationLevel 17MediumChemistryWhile determining molar mass by the depression-in-freezing-point method, in which situation will the observed molar mass of a solute be greater than its actual molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18HardChemistryA substance has a normal molar mass of 120 g mol⁻¹, but freezing-point depression gives an observed molar mass of 60 g mol⁻¹. If it dissociates into two ions, what is the degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18HardChemistryIf the molar mass of a solute determined from colligative properties is greater than its true molar mass, which process is likely occurring in the solute?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18MediumChemistryIn determining molar mass using colligative properties, what is the main effect of association of solute particles?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18MediumChemistryIn which situation does association of solute molecules cause the observed molar mass to be greater than the actual molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium