120 gm urea is present in 5 L solution, the active mass of urea is

• 0.2

• 0.06

• 0.4

• 0.08

The vapour pressure ofa pure liquid 'A' is 0.80 atm. When a non-volatile solute 'B' is dissolved in 'A' its vapour pressure becomes 0.60 atm. The mole fraction of 'B' in the solution is

• 0.125

• 0.25

• 0.50

• 0.75

Which of the following does not show negative deviation from Raoult's law?

• Acetone -Chloroform

• Acetone-Benzene

• Chloroform- Ether

• Chloroform- Benzene

50mL of benzene is mixed with 50mL of chloroform. What is the volume of solution?

• Less than 100 mL

• More than 100 mL

• Equal to 100 mL

• None of the above

Which of the following is a colligative property?

• Surface tension

• Viscosity

• Osmotic pressure

• Vapour pressure

Four solutions A, B, C, D has glucose 0.5 M, NaCl 0.1 M, BaCl₂ 0.5 M and MgCl₂ 0.1 M, then which of the following will have highest osmotic pressure?

• Glucose

• BaCl₂

• MgCl₂

• NaCl

The highest boiling point is of

• FeCl₂

• FeCl₃

• Al₂(SO₄)₃

• AlCl₃

The volume strength of 1.5 N H₂O₂ solution is

• 8.4

• 4.8

• 5.2

• 8.8

129.

On dissolving a non-volatile solute in a solvent, the vapour pressure of the solvent is decreased by 10 mm of mercury. The mole fraction of the solute in this solution is 0.2. If the vapour pressure of the solvent is decreased by 20 mm of mercury by dissolving more solute, what is the mole fraction of solvent in this solution now?

• 0.2

• 0.4

• 0.6

• 0.8

During osmosis, flow of water through a semi-permeable membrane is

• from both sides of semi-permeable membrane with equal flow rate

• from solution having lower concentration only

• from solution having higher concentration only

• None of the above