Q. No.The incorrect statement among the following is:
1.
Units of atmospheric pressure and osmotic pressure are the same.
2.
In reverse osmosis, solvent molecules move through a semipermeable membrane from a region of lower concentration of solute to a region of higher concentration.
3.
The value of molal depression constant depends on nature of solvent.
4.
Relative lowering of vapour pressure, is a dimensionless quantity.
The value of Henry's constant KH -
1. Increases with increase in temperature.
2. Decreases with increase in temperature.
3. Remains constant.
4. First increases then decreases.
The value of Henry's constant, KH is ......... .
1. Greater for gases with higher solubility.
2. Greater for gases with lower solubility.
3. Constant for all gases.
4. Not related to the solubility of gases.
Consider the figure and mark the correct option.
| 1. | Water will move from the side (B) to side (A) if pressure is lower than the osmotic pressure is applied on piston (B). |
| 2. | Water will move from side (B) to side (A) if a pressure greater than osmotic pressure is applied on piston (B). |
| 3. | Water will move from side (B) to side (A) if a pressure equal to osmotic pressure is applied on piston (B). |
| 4. | Water will move from side (A) to side (B) if pressure equal to osmotic pressure is applied on piston (A). |
Three aqueous solutions of NaCl are labelled as ‘A', ‘B’ and ‘C with concentrations 0.1 M, 0.01 M and 0.001 M, respectively. The value of van’t Hoff factor for these solutions will be in the order of -
1. iA < iB < iC
2. iA > iB > iC
3. iA = iB = iC
4. iA < iB > iC
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. |
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