6 g of a non-volatile, non-electrolyte X dissolved in 100 gm of water freezes at -0.93°C. The molar mass of X in g mol^-1 is (K_f of H₂O = 1.86 K kg mol^-1).

• 60

• 140

• 180

• 120

The order of basic strength of the following in aqueous solution is

I. C₆H₅NH₂

II. (CH₃)₃N

III. NH₃

IV. CH₃NH₂

V. (CH₃)₂NH

• IV > I > V > III > II

• II > V > IV > III > I

• V > IV > II > III > I

• IV > III > V > II > I

Which one of the following solutions of compounds show highest osmotic pressure?[AB, AB₂,A₂B₃ are ionic compounds]

• 5.0 M urea i= 10 and temperature is 67°C

• 1.5M A₂B₂ type i= 41 temperature is 27°C

• 3.0 M AB type i= 16 and temperature is 27°C

• 2.5 M AB₂ type i = 2.5 and temperature is 57°C.

31g of ethylene glycol (C₂H₆O₂) is dissolved in 600 g of water. The freezing point depression of the solution is (K_f for water is 1.86 K kg mol^-1)

• 0.77 K

• 1.55 K

• 4.65 K

• 3.10 K

One mole of a solute A is dissolved in a given volume of a solvent. The association of the solute takes place according to nA $\rightleftharpoons$ [A]_n. The van't Hoff factor (i) is expressed as:

• i = 1 - x

• i = 1 + $\frac{\mathrm{x}}{\mathrm{n}}$

• i = $\frac{1 - \mathrm{x} + {\displaystyle \frac{\mathrm{x}}{\mathrm{n}}}}{1}$

• i = 1

Freezing point of water is 0°C. At what temperature will one molal solution of NaCl freeze if NaCl is taken to be completely dissociated (molal depression constant of water = 1.86)?

• -3.72°C

• -1.86°C

• 0°C

• 3.72°C

397.

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