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.

563.

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

At same temperature which pair of the following solutions are isotonic ?

• 0.2 M BaCl₂ and 0.2 M urea

• 0.1 M urea and 0.1 M NaCl

• 0.1 M NaCl and 0.1 M K₂SO₄

• 0.1 M Ba(NO₃)₂ and 0.1 M Na₂SO₄

Which is not a colligative property ?

• Refractive index

• Lowering of vapour pressure

• Depression in freezing point

• Elevation in boiling point

Assertion : A non volatile solute is mixed in a solution then elevation in boiling point and depression in freezing point both are 2 K.

Reason : Elevation in boiling point and depression in freezing point both depend on melting point of non-volatile solute.

• 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.

The mass of glucose that should be dissolved in SO g of water in order to produce the same lowering of vapour pressure as is produced by dissolving 1 g of urea in the same quantity of water is :

• 1 g

• 3 g

• 6 g

• 18 g