Q. No.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
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 and b | 2. | b and c |
| 3. | c and d | 4. | a and 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)
The van't hoff factor (i) is given by the expression:
(a)
(b)
(c)
(d)
The correct choice among the given options is:
1. a and b
2. b and c
3. c and d
4. a and 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 |
The correct choice is:
| 1. | a and b | 2. | b and c |
| 3. | c and d | 4. | a and d |
The correct choice among the given regarding isotonic solutions is /are:
| (a) | Solute and solvent both are same |
| (b) | Osmotic pressure is same |
| (c) | Solute and solvent may or may not be same |
| (d) | Solute is always same solvent may be different |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
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