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Class 12 Mcq

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

ChemistryThe apparent molar mass of a solute is 0.40 times its true molar mass. If it dissociates into three ions, what is the degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 15Hard ChemistryIf K_b = 0.52 K kg mol⁻¹, m = 0.50 mol kg⁻¹, and observed ΔT_b = 0.39 K, what is i?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 12Medium ChemistryA 0.01 M solution has an osmotic pressure of 0.369 atm at 27°C. Taking R = 0.082 L atm mol⁻¹ K⁻¹, what is the approximate value of i?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 14Hard ChemistryFor a solute, elevation in boiling point is lower than the normal expected value. What is the most likely reason?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 9Easy ChemistryFor a solution with K_f = 2.0 K kg mol⁻¹, molality 0.20 mol kg⁻¹, and observed ΔT_f = 0.60 K, what is i?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 13Medium ChemistryA solute has i = 0.40 and forms only trimers. What is the approximate degree of association?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 14Hard ChemistryA solute forms trimers and 60% of its molecules become associated. What is the van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 13Medium ChemistryIf the osmotic pressure of a solution is 1.8 times the normally expected value, what is its van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 9Easy ChemistryTwo solutions have the same molality. In the first, the solute completely dimerises; in the second, it completely dissociates into two ions. What is the ratio of their freezing-point depressions?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 13Hard ChemistryA weak electrolyte XY has i = 1.25 and gives two ions. What is its degree of dissociation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 11Medium ChemistryA solute has i = 0.75. If it only forms dimers, what is the degree of association?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 12Medium ChemistryAB₃ undergoes 40% dissociation into A³⁺ and three B⁻ ions. What fraction of the true molar mass is the apparent molar mass?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 14Hard ChemistryThe apparent molar mass of a solute is double its true molar mass. What is the most suitable explanation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 12Medium ChemistryA salt MX₂ is 75% dissociated. Since it gives three ions on complete dissociation, what is its van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 11Medium ChemistryAn acid dimerises in benzene. The expected freezing-point depression is 0.50 K, but the observed value is 0.30 K. What is the approximate degree of association?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 17Hard ChemistryA solute has true molar mass 120 g mol⁻¹ and apparent molar mass 80 g mol⁻¹. What is its van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 11Medium ChemistryAn electrolyte AB is 60% dissociated into A⁺ and B⁻. What is its van’t Hoff factor?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 11Medium ChemistryA solute completely dimerises in solution. If its true molar mass is M, what apparent molar mass is obtained from freezing-point depression?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 12Medium ChemistryA solute has normal molar mass 56 and observed molar mass 28. What is the most suitable explanation?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 10Medium ChemistryA solute has normal molar mass 80 and observed molar mass 160. Which process is possible?Class 12Chapter 01: Solutions7: Abnormal Molecular MassLevel 10Medium