551.

Osmosis involved in :

• excretion of urine

• interchange of nutrients and waste products betweeen tissue cells and their surroundings

• in both cases

• None of the above

Vapour density of PCl₅ (g) dissociating into PCl₃ (g) and Cl₂ (g) is 100. Hence, van't Hoff factor for the case :

PCl₅ (g) $\rightleftharpoons$ PCl₃ (g) + Cl₂ (g) is :

• 1.85

• 3.70

• 1.085

• 1.0425

Assertion : Acetone and aniline shows negative deviations.

Reason : H-bonding between acetone and aniline is stronger than that between acetoneacetone and aniline-aniline.

• 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.

Which salt is insoluble in water ?

• NH₄Cl

• KCl

• Na₂SO₄

• NaCl

Assertion : A solution of sucrose in water is dextrorotatory. But on hydrolysis in the presence of a little hydrochloric acid, it becomes laevorotatory.

Reason : Sucrose on hydrolysis gives unequal amounts of glucose and fructose. As a result of this, change in sign ofrotation is observed.

• 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.

What happens when chloroform is left open in air in the presence of sunlight?

• Explosion takes place

• Phosgene, a poisonous gas is formed.

• Polymerisation takes place.

• No reaction takes place.

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