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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।

ChemistryA solute gives molar masses of 120 g mol⁻¹ by boiling-point elevation and 60 g mol⁻¹ by osmotic pressure. If both experiments are reliable, what is the most probable explanation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Hard ChemistryDue to association, the apparent molar mass is 180 g mol⁻¹, while the true molar mass is 90 g mol⁻¹. What is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIf a solute completely dissociates into three ions in solution, how will its apparent molar mass compare with its true molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryA solute has a true molar mass of 60 g mol⁻¹, but freezing-point depression gives an apparent molar mass of 30 g mol⁻¹. What is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIf the molar mass of an acid in benzene, determined from freezing-point depression, is nearly double the expected value, what does it indicate?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryAn electrolyte of the type A₂B₃ has a van’t Hoff factor (i) of 3.4. On complete dissociation, one formula unit produces five particles. What is the degree of dissociation of the electrolyte?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryIf the observed molar mass of a solute is 1.6 times the true molar mass, what is the van’t Hoff factor and the probable behaviour of the solute?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Hard ChemistryIf the observed molar mass of a solute is 0.4 times the true molar mass, what is the van’t Hoff factor and the probable behaviour of the solute?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Hard ChemistryThe observed molar mass of an A₂B-type solute is 1/2.4 of its true molar mass. What is the degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Hard ChemistryAn AB-type solute is 60% dissociated. If its observed molar mass is 75 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryA substance forms trimers to the extent of 45%. If its true molar mass is 210 g mol⁻¹, what will be the approximate observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Hard ChemistryA substance undergoes 60% dimerization. If its observed molar mass is 200 g mol⁻¹, what is its true molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryA solution has an actual molarity of 0.03 M and a van’t Hoff factor of 1.8. If the true molar mass of the solute is 180 g mol⁻¹, what observed molar mass would be obtained by a colligative-property method?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Medium ChemistryThe observed molar mass of an AB3-type solute is 4/7 of the true value. What is the degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Hard ChemistryA solute forms dimers. Its true molar mass is 90 g mol−1 and its observed molar mass is 120 g mol−1. What is the degree of association?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 16Hard ChemistryIf the normal molar mass of a substance is 170 g mol⁻¹ and i = 0.85 because of 20% tetramer association, what is the observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIf the observed molar mass in a solution is 1.25 times the normal molar mass, what is the van’t Hoff factor i?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Medium ChemistryIf the observed molar mass of an AB₃ salt is half of its normal molar mass, what is the degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Hard ChemistryA salt of type AB₃ undergoes 50% dissociation. If its normal molar mass is 200 g mol⁻¹, what will be its observed molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Hard ChemistryA 0.2 M electrolyte has an osmotic pressure of 7.38 atm at 300 K. If R = 0.082 L atm K⁻¹ mol⁻¹, what is i, and what type of dissociation does it indicate?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 18Hard