CBSE
Multiple Choice Questions1.00 g of a non- electrolyte solute (molar mass 250 g mol-1) was dissolved in 51.2 g of benzene. If the freezing point depression constant, Kf of benzene is 5.12 K Kg mol-1, the freezing point of benzene will be lowered by:
0.4 K
0.3 K
0.5 K
0.5 K
During osmosis, flow of water through a semi-permeable membrane is:
from a solution having higher concentration only
from both sides of a semi-permeable membrane with equal flow rates
from both sides of a semi-permeable membrane with unequal flow rates
from both sides of a semi-permeable membrane with unequal flow rates
Following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations :
pH of which one of them will be equal to 1?
b
a
c
d
A solution containing 10 g per dm3 is urea (molecular mass = 60 g mol-1) is isotonic with a molecular mass of this non-volatile solute. The molecular mass of this of this non-volatile solute is:
250 g mol-1
300 g mol-1
350 g mol-1
350 g mol-1
0.5 Molal aqueous solution of aweak acid (HX) is 20% ionised. If Kf for water is1.86 K kg mol-1, the lowering in freezing point of the solution is:
-1.12 K
0.56 K
1.12 K
1.12 K
The solubility of BaSO4 in water is 2.42 × 10–3 gL–1 at 298 K. The value of its solubility product (Ksp) will be
(Given the molar mass of BaSO4 = 233 g mol–1)
1.08 x 10-10 mol2L-2
1.08 x 10-12 mol2L-2
1.08 x 10-8 mol2L-2
1.08 x 10-14 mol2L-2
The normality of 10% (w/v) of acetic acid is
1 N
1.3 N
1.7 N
1.9 N
A solution of acetone in ethanol:
shows a negative deviation from Raoult's law
shows a positive deviation from Raoult's law
behave likea near ideal solution
behave likea near ideal solution
Which of the following is dependent on temperature?
Molality
Molarity
Mole fraction
Mole fraction
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be
Doubled
Halved
Tripled
Tripled
