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Abnormal Molecular Mass

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

ChemistryThe normal molar mass of NaCl is 58.5 g mol⁻¹. If the van’t Hoff factor is 1.8 in solution, what is the approximate observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryThe normal molar mass of an organic acid is 120 g mol⁻¹. In benzene, its observed molar mass is 240 g mol⁻¹. Which reason explains this result?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryThe normal molar mass of a solute is 60 g mol⁻¹, but its observed molar mass from colligative properties is 30 g mol⁻¹. What is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIn molar-mass determination, if a solute dissociates into ions, which correction is required in the formula?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf a \(0.5\,\mathrm{mol\,kg^{-1}}\) solution contains \(250\,\mathrm{g}\) of solvent, how many moles of solute are present?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Easy ChemistryThe normal molar mass of a solute is \(90\,\mathrm{g\,mol^{-1}}\). If the van’t Hoff factor is \(i=3\), what will be the observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf the observed molar mass of a substance is double its normal value, what is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Easy ChemistryIf the observed molar mass of a substance is half of its normal value, what is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Easy ChemistryIf a solute associates to form dimers, why does the molar mass obtained from colligative properties generally increase?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf the van’t Hoff factor is 2 and the normal molar mass is 100 g mol⁻¹, what is the observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Easy ChemistryThe depression in freezing point of a solution is 0.186 K. If K_f = 1.86 K kg mol⁻¹ and the molality of the solution is 0.1 mol kg⁻¹, what is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Easy ChemistryIf an electrolyte gives an observed molar mass lower than its normal molar mass during molar-mass determination, what is the reason?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf the observed molar mass is greater than the normal molar mass, what is the simplest possible reason?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf the normal molar mass is 120 g mol⁻¹ and the observed molar mass is 60 g mol⁻¹, what is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf a solute forms complete dimers, the observed molar mass from the colligative method will be how many times the true value?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium ChemistryIf solute AB completely dissociates into A⁺ and B⁻, the observed molar mass from the colligative method will be what fraction of the true value?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium ChemistryIf a solute undergoes association, how will the molar mass obtained by a colligative-property method compare with its true molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium ChemistryIf a solute undergoes dissociation, how will the molar mass calculated without applying the van’t Hoff factor compare with the true molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium ChemistryIf the observed molar mass is 1.25 times the true molar mass, what is the van’t Hoff factor (i)?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium ChemistryIf the observed molar mass of a solute is 2/3 of its true molar mass, what is the van’t Hoff factor (i)?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Medium