The unit of Ebullioscopic constant is:
1. K kg mol–1 or K (molality)–1
2. mol kg K–1 or K–1 (molality)
3. kg mol–1 K–1 or K–1 (molality)–1
4. K mol kg–1 or K (molality)
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. |
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). |