Q1. The depression in freezing point for a formic acid solution is 0.0405°C. Density of formic acid is 1.05 g mL⁻¹. The van’t Hoff factor is nearly:

Q2. Vapour pressure of solvent decreases by 10 mm Hg when mole fraction of solute is 0.2. If decrease is 20 mm Hg, mole fraction of solvent is:

Q3. What mass of glucose must be dissolved in 100 g water to lower vapour pressure by 0.20 mm Hg?

Q4. Vapour pressure of benzene and methyl benzene are 80 and 24 Torr. Mole fraction of methyl benzene in vapour phase (×10⁻²):

Q5. 1 g each of AB and AB₂ raise boiling point by 2.7 K and 1.5 K respectively. Atomic mass of A (×10⁻¹):

Q6. Order of van’t Hoff factor for NaCl solutions of 0.1 M, 0.01 M, 0.001 M:

Q7. At 27°C, solution exerts osmotic pressure of 400 Pa. Molar mass of solute:

Q8. Degree of dissociation of weak monobasic acid is 0.3. Percentage increase in freezing point:

Q9. For ideal solution, relation between mole fractions is:

Q10. Vapour pressure of pure liquid A (atm) if total pressure is 0.8 atm: