Solutions JEE

1. Which of the following will have same value of Van’t Hoff factor as that of Al₂(SO₄)₃?

2. Vapor pressure of chloroform (CHCl₃) and dichloromethane (CH₂Cl₂) at 25 C ° are 200 mm of Hg and 41.5 mm of Hg respectively. Vapor pressure of the solution obtained by mixing 25.5 g of CHCl₃ and 40 g of CH₂Cl₂ at the same temperature will be: (Molecular mass of CHCl₃ = 119.5 u and molecular mass of CH₂Cl₂ = 85 u)

3. Statement I: The molecular weight of acetic acid determined by depression in freezing point method in benzene and water was found to be different.
Statement II: Water is polar, and benzene is non-polar.

4. Statement I: 1.575 g H₂C₂O₄.2H₂O in 250 mL solution makes it 0.1 N.
Statement II: H₂C₂O₄.2H₂O is a dihydrate organic acid.

5. An aqueous solution is 1.00 molal in KI. Which change will cause the vapor pressure of the solution to increase? 

6. The vapor pressure of acetone at 20 C ° is 185 torr. When 1.2 g of a non-volatile substance was dissolved in 100 g of acetone at 20 C °, its vapor pressure was 183 torr. The molar mass (g mol^-1) of the substance is:

7. Statement I: Freezing point of solvent is more than that of solution.
Statement II: When non-volatile solid is added to the solvent, its vapor pressure increases and become equal to solid solvent at the lower temperature.

8. 10% (m/m) aqueous potassium iodide has a density of 1.202 g mL ^-1. The true statements about this solution is:

9. For a dilute solution containing 2.5 g of a non-volatile non-electrolyte solute in 100 g of water, the elevation in boiling point at 1 atm pressure is 2 C °. Assuming concentration of solute is much lower than the concentration of solvent, the vapor pressure (mm of Hg) of the solution is: (take K_b = 0 76. K kg mol^-1)

10. 29.2% (w/w) HCl stock solution has density of 1.25 g mL^-1. The molecular weight of HCl is 36.5 g mol^-1. The volume (mL) of stock solution required to prepare a 200 mL solution 0.4 M HCl is

11. How many grams of concentrated nitric acid solution should be used to prepare 250 mL of 2.0 M HNO₃? The concentrated acid is 70% HNO₃.

12. Match the following columns and choose the correct option from the codes given below.

13. Match the following Henry’s law constant values for gases in water at 298 K.

14. What is the composition of gases in the tanks used by the scuba divers?

15. Statement I: The water pouch of instant cold pack for treating athletic injuries breaks when squeezed and NH₄NO₃ dissolves in water to lower the temperature.
Statement II: Addition of non-volatile solute into solvent results into depression of freezing point of the solvent.

16. Match the items given in Column I with the type of solutions given in Column II.

17. How many grams of methyl alcohol should be added to 10 L tank of water to prevent its freezing at 268 K? 

18. The correct statement about the mixture of phenol and aniline is:

19. Raoult’s law becomes a special case of Henry’s law when:

20. Match the following Column I which represent concentration term to the Column II representing their corresponding formulae:

21. Statement I: Melting point of a substance is used for testing the purity of the substance.
Statement II: There is no other method to determine the purity of substance.

22. Pure benzene freezes at 5.3°C. A solution of 0.223 g of phenylacetic acid (C₆H₅CH₂COOH) in 4 4. g of benzene (K_f =5.12 K kg mol ^-1) freezes at 4.47°C. From this observation, one can conclude that:

23. Statement I: When non-volatile solute is added to solvent, the vapor pressure of the solution decreases.
Statement II: As number of solvent molecules escaping from the surface is reduced, the vapor pressure of the solution is also reduced.

24. A 5.2 molal aqueous solution of methyl alcohol, CH₃OH is supplied. What is the mole fraction of methyl alcohol in the solution?

25. Vapor pressure of pure benzene is 119 torr and that of toluene is 37.0 torr at the same temperature. Mole fraction of toluene in vapor phase which is in equilibrium with the solution of benzene and toluene having a mole fraction of toluene 0.50, will be