131.

Out of the following fractions of petroleum the one having the lowest boiling point is

• kerosene oil

• diesel oil

• gasoline

• heavy oil

Two vessels containing gases A and B are interconnected as shown in the figure. The stopper is opened, the gases are allowed to mix homogeneously. The partial pressures of A and B in the mixture will be, respectively

• 8 and 5 atm

• 9.6 and 4 atm

• 4.8 and 2 atm

• 6.4 and 4 atm

If 0.1 M solutions of each electrolyte are taken and if all electrolytes are completely dissociated, then whose boiling point will be highest?

• Glucose

• KCl

• BaCl₂

• K₂[Fe(CN)₆]

The percentage composition by weight of an aqueous solution of a solute (molar mass 150) which boils at 373.26 K (k_b = 0.52) is

• 7

• 6

• 9

• 15

Solutions P, Q, R and S are respectively 0.1 M glucose, 0.05 M NaCl, 0.05 M BaCl₂ and 0.1 M AlCl₃.Which one of the following pairs is isotonic?

• P and Q

• Q and R

• P and S

• P and R

 10g of glucose (π₁), 10g of urea(π₂)and 10g of sucrose (π₃)are dissolved in 250ml of water at 300K. Correct order of osmotic pressure of solutions is

• π₁> π₂> π₃

•  π₃ > π₁> π₂

• π₂> π₃ > π₁

• π₂>  π₁ > π₃

Vapour pressure of a solution at 100° C having 3.42 g of cane sugar in 180 g water is

• 759.2 mm

• 760 mm

• 740 mm

• 748.5 mm

1% (W/V) solutions of KCl is dissociated to the extent of 82%. The osmotic pressure at 300 K will be

• 3.2 atm

• 5.824 atm

• 4.0 atm

• 6.0 atm

Sodium chloride is an ionic compound where as hydrogen chloride gas is mainly covalent because

• electronegativity difference in the case of hydrogen is less than 2.1

• hydrogen chloride is a gas

• hydrogen is a non-metal

• sodium is reactive

The decomposition of dinitrogen tetroxide at 300 K and 1.0 atm pressure is 20%, At equilibrium, the partial pressure (in atm) of nitrogen peroxide is

• 0.2

• 0.67

• 0.33

• 0.8