On the basis of the information given below mark the correct option.
Information
i. | In bromoethane and chloroethane mixture intermolecular interactions of A—A and B—B type are nearly the same as A—B type interactions. |
ii. | In ethanol and acetone mixture A—A or B—B type intermolecular interactions are stronger than A—B type interactions. |
iii. | In chloroform and acetone mixture A—A or B—B type intermolecular interactions are weaker than A—B type interactions. |
1. Solution (ii) and (iii) will follow Raoult’s law
2. Solution (i) will follow Raoult’s law
3. Solution (ii) will show negative deviation from Raoult’s law
4. Solution (iii) will show positive deviation from Raoult’s law
Two beakers of capacity 500 mL were taken. One of these beakers, labelled as “A”, was filled with 400 mL water whereas the beaker labelled “B“ was filled with 400 mL of 2M solution of NaCl. At the same temperature, both the beakers were placed in closed containers of the same material and the same capacity as shown in the figure.
At a given temperature, which of the following statements is correct about the vapour pressure of pure water and that of NaCl solution?
1. | Vapour pressure in container (A) is more than that in container (B) |
2. | Vapour pressure in container (A)is less than that in container (B) |
3. | Vapour pressure is equal in both containers |
4. | The vapour pressure in container (B) is twice the vapour pressure in container(A) |
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)