Benzene and toluene form nearly ideal solutions. At 20^o C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20^o  C for a solution containing 78 g of benzene and 46 g of toluene in torr is

• 50

• 25

• 37.5

• 37.5

32.

Two solutions of a substance (non-electrolyte) are mixed in the following manner. 480 ml of 1.5 M first solution + 520 mL of 1.2 M second solution. What is the molarity of the final mixture?

• 1.20 M

• 1.50 M

• 1.344 M

• 1.344 M

Equimolar solutions in the same solvent have

• Same boiling point but different freezing point

• Same freezing point but different boiling point

• Same boiling and same freezing points

• Same boiling and same freezing points

Which one of the following aqueous solutions will exhibit highest boiling point?

• 0.01 M Na₂SO₄

• 0.015 M glucose

• 0.015 M urea

• 0.015 M urea

6.02×10²⁰ molecules of urea are present in 100 ml of its solution. The concentration of urea solution is

• 0.001 M

• 0.1 M

• 0.02 M

• 0.02 M

To neutralize completely 20 mL of 0.1 M aqueous solution of phosphorous acid (H₃PO₃), the volume of 0.1 M aqueous KOH solution required is

• 10 mL

• 60 mL

• 40 mL

• 40 mL

Which of the following liquid pairs shows a positive deviation from Raoult’s law?

• Water – hydrochloric acid

• Acetone – chloroform

• Water – nitric acid

• Water – nitric acid

Which one of the following statements is false?

• Raoult’s law states that the vapour pressure of a components over a solution is proportional to its mole fraction

• Two sucrose solutions of same molality prepared in different solvents will have the same freezing point depression

• The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl₂ > KCl > CH₃COOH > sucrose

• The correct order of osmotic pressure for 0.01 M aqueous solution of each compound is BaCl₂ > KCl > CH₃COOH > sucrose

The molar solubility product is K_sp. ‘s’ is given in terms of K_sp by the relation

• 
• 

• s = (256 K_sp)^1/5

• s = (256 K_sp)^1/5

For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point?

• [Co(H₂O)₃ Cl₃].3H₂O

• [Co(H₂O)₆]Cl₃

• [Co(H₂O)₅Cl] Cl₂.H₂O

• [Co(H₂O)₄Cl2]Cl.2H₂O