CBSE
Multiple Choice QuestionsA 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
1.00 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
If molality of the dilute solution is doubled, the value of molal depression constant (Kf) will be
Doubled
Halved
Tripled
Tripled
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
Which of the following is dependent on temperature?
Molality
Molarity
Mole fraction
Mole fraction
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
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
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
