Osmotic pressure of 0.4% urea solution is 1.64 atm and that of 3.42% cane sugar is 2.46 atm. When the above two solutions are mixed, the osmotic pressure of the resulting solution is :

• 0.82 atm

• 2.46 atm

• 1.64 atm

• 4.10 atm

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

• 0.01 M Na₂SO₄

• 0.01 M KNO₃

• 0.015 M urea

• 0.015 M glucose

Which of the following is not a colligative property?

• optical activity

• Osmotic pressure

• Depression of freezing point

• elevation of boiling point

The vapour pressure of pure liquid A is 0.80 atm. When a non volatile B is added to A its vapour pressure drops to 0.60 atm. The mole fraction of B in the solution is

• 0.125

• 0.25

• 0.5

• 0.75

Osmotic pressure of a solution at a given temperature

• increases with concentration

• decreases with concentration

• remains same

• initially increases and then decreases

The osmotic pressure (At 27° C) of an aqueous solution (200 mL) containing 6 g of a protein is 2 × 10^-3 atm. If R = 0.080 L atm mol^-1 K^-1 , the molecular weight of protein is

• 7.2 × 10⁵

• 3.6 × 10⁵

• 1.8 × 10⁵

• 1.0 × 10⁵

The melting point is highest for

• rock salt

• potassium chloride

• magnesium oxide

• barium oxide

The order of increasing boiling points of-

I. acetyl chloride;

II. acetic anhydride;

III. acetamide;

IV. acetic acid is

• IV > I > II > III

• I > IV > II > III

• II < I < III < IV

• I < IV < II < III

When common salt is dissolved in water

• the melting point of the solution increases

• the boiling point of the solution increases

• the boiling point of the solution decreases

• both the melting and bolling point of the solution decrease

The method which is used to measure the osmotic pressure of a solution quickly and accurately is

• Berkeley-Hartley's method

• de varies method

• Pfeffer's method

• All of the above