Multiple Choice QuestionsThe 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 volume strength of 1.5 N H2O2 solution is
8.4
4.8
5.2
8.8
A.
8.4
We know that,
Strength = Normality × equivalent weight of H2O2
= 1.5 × 17
Strength of 1.5 N H2O2 solution = 25.5 gm/ L
Now, 68 gm of H2O2 gives 22400 mL O2 NTP
25.5 gm of H2O2 gives = 8400 mL of O2 at NTP
But, 25.5 gm of H2O2 are present in 1000 mL of H2O2 solution.
Hence, 1000 mL of H2O2 solution gives 8400 mL of O2 at NTP.
1 mL of H2O2 solution will give = 8.4 mL of O2 at NTP.
So, the volume of 1.5 N H2O2 solution is 8.4 volume.
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
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