If two liquids A and B form minimum boiling azeotrope at some specific composition then:
1. | A—B interactions are stronger than those between A—A or B—B |
2. | Vapour pressure of solution increases because more number of molecules of liquids A and B can escape from the solution |
3. | Vapour pressure of solution decreases because less number of molecules of only one of the liquids escape from the solution |
4. | A—B interactions are weaker than those between A—A or B—B |
4 L of 0.02 M aqueous solution of NaCl was diluted by adding 1 L of water. The molarity of the resultant solution is:
1. | 0.004 M | 2. | 0.008 M |
3. | 0.012 M | 4. | 0.016 M |
Information: Some hydrogen bonds between methanol molecules are disrupted after adding acetone to methanol.
Select the appropriate option:
1. | At specific compositions, a methanol-acetone mixture will form a minimum boiling azeotrope and show a positive deviation from Raoult’s law. |
2. | At specific compositions, a methanol-acetone mixture will form a maximum boiling azeotrope and show a positive deviation from Raoult’s law. |
3. | At specific compositions, a methanol-acetone mixture will form a minimum boiling azeotrope and show a negative deviation from Raoult’s law. |
4. | At specific compositions, a methanol-acetone mixture will form maximum boiling azeotrope and show a negative deviation from Raoult’s law. |
KH value for Ar(g), CO2 (g), HCHO (g) and CH4(g) are 40.39, 1.67, 1.83 × and 0.413 respectively.
Arrange these gases in the order of their increasing solubility.
1. HCHO < CH4 < CO2 < Ar
2. HCHO < CO2 < CH4 < Ar
3. Ar < CO2 < CH4 < HCHO
4. Ar < CH4 < CO2 < HCHO
Which of the following factor (s) affect the solubility of a gaseous solute in the fixed volume of liquid solvent?
(i) Nature of solute
(ii) Temperature
(iii) Pressure
a. (i) and (iii) at constant T
b. (i) and (ii) at constant p
c. (ii) and (iii)
d. Only (iii)
Choose the correct option
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, d) |
The strength of intermolecular forces between two benzene molecules is approximately equivalent to that between two toluene molecules.
(a) | ΔHmix= zero |
(b) | ΔVmix = Zero |
(c) | They will form a minimum boiling azeotrope |
(d) | They will not form an ideal solution |
Identify the incorrect statements (from a to d given above) regarding a mixture of benzene and toluene:
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, d) |
Relative lowering of vapor pressure is a colligative property because:
(a) | It depends on the concentration of a non-electrolyte solute in a solution and does not depend on the nature of the solute molecules |
(b) | It depends on the number of particles of electrolyte solute in a solution and does not depend on the nature of the solute particles |
(c) | It depends on the concentration of a non-electrolyte solute in solution as well as on the nature of the solute molecules |
(d) | It depends on the concentration of an electrolyte or non-electrolyte solute in solution as well as on the nature of solute molecules |
The correct choice among the given is:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Van't Hoff factor (i) is given by the expression:
a.
b.
c.
d.
The correct choice among the given options are:
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
Isotonic solutions must have the same:
(a) | Solute |
(b) | Density |
(c) | Elevation in boiling point |
(d) | Depression in freezing point |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Which of the following binary mixtures will have the same composition in the liquid and vapour phase?
(a) | Benzene-toluene | (b) | Water-nitric acid |
(c) | Water-ethanol | (d) | n-Hexane-n-heptane |
1. | (a, b) | 2. | (b, c) |
3. | (c, d) | 4. | (a, d) |