Q. No.In comparison to a 0.01 M solution of glucose, the depression in the freezing point of a 0.01 M MgCl2 solution will be:
1.
Same
2.
About twice
3.
About three times
4.
About six times
An unripe mango placed in a concentrated salt solution to prepare pickle shrivels because:
| 1. | It gains water due to osmosis. |
| 2. | It loses water due to reverse osmosis. |
| 3. | It gains water due to reverse osmosis. |
| 4. | It loses water due to osmosis. |
At a given temperature, osmotic pressure of a concentrated solution of a substance:
| 1. | Is higher than that of a dilute solution. |
| 2. | Is lower than that of a dilute solution. |
| 3. | Is same as that of a dilute solution. |
| 4. | Cannot be compared with osmotic pressure of dilute solution. |
The incorrect statement among the following is:
| 1. | Two different solutions of sucrose of the same molality prepared in different solvents will have the same depression in freezing point. |
| 2. | The osmotic pressure of a solution is given by the equation π = CRT (where C is the molarity of the solution) |
| 3. | Decreasing order of osmotic pressure for 0.01 M aqueous solutions of BaCl2 > KCl > CH3COOH > sucrose |
| 4. | The vapour pressure exerted by a volatile component of a solution is directly proportional to its mole fraction in the solution. |
The values of van’t Hoff factors for KCl, NaCl and K2SO4 respectively are:
| 1. | 2, 2 and 2 | 2. | 2, 2 and 3 |
| 3. | 1, 1 and 2 | 4. | 1, 1 and 1 |
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. |
| 1. | Increases with an increase in temperature. |
| 2. | Decreases with an increase in temperature. |
| 3. | Remains constant. |
| 4. | First increases then decreases. |
According to Henry’s law, the value of Henry’s constant (KH) for a gas is:
| 1. | Directly proportional to the solubility of the gas in the liquid. |
| 2. | Inversely proportional to the solubility of the gas in the liquid. |
| 3. | Same for all gases under identical conditions. |
| 4. | Independent of the solubility of the gas |
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
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