Which of the following can be measured by the Ostwald-Walker dynamic method ?

• Relative lowering of vapour pressure

• Lowering of vapour pressure

• Vapour pressure of the solvent

• All of the above

The relationship between osmotic pressure at 273 K when 10 g glucose (P₁), 10 g urea (P₂) and 10 g sucrose (P₃) are dissolved in 250 mL of water is

• P₁ > P₂ > P₃

• P₃ > P₁ > P₂

• P₂ > P₁ > P₃

• P₂ > P₃ > P₁

The value of Henry's constant K_H is

• greater for gases with higher solubility

• greater for gases with lower solubility

• constant for all gases

• not related to the solubility of gases.

Which of the following solutions will have the highest boiling point ?

• 0.1 M FeCl₃

• 0.1 M BaCl₂

• 0.1 M NaCl

• 0.1 M urea

Azeotropic mixture of HCl and water has :

• 48% HCl

• 22.2% HCl

• 36% HCl

• 20.2% HCI

Assertion: An ideal solution obeys Raoult's law.

Reason: In an ideal solution, solute-solute as well as solvent-solvent interactions are similar to solute-solvent interactions.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

287.

For a dilute solution , Raoult's law states that :

• the lowering of vapour pressure is equal to mole fraction of solute

• the relative lowering of vapour pressure is equal to mole fraction of solute

• the relative lowering of vapour pressure is proportional to the amount of solute in solution

• the vapour pressure of the solution is equal to the mole fraction of solvent

A gaseous mixture contains 56 g N₂ , 44 g CO₂ and 16 g CH₄ .The total pressure of the mixture is 720 mm Hg .What is the partial pressure of CH₄ ?

• 142 mm

• 156 mm

• 182 mm

• 180 mm

Assertion : The solubility of a gas in a liquid increases with increase of pressure.

Reason : The solubility of a gas in a liquid is directly proportional to the pressure of the gas.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.

0.5 molal solution of ethylene glycol in water is used as coolant in car .If the freezing point depression constant ofwater is l.86°C per mol , the mixture will freeze at :

• 0.93 °C

• - 0.93 °C

• 1.86 °C

• - 1.86 °C