Q. No.Which of the following changes decrease the vapour pressure of water kept in a sealed vessel?
(a) Decreasing the quantity of water
(b) Adding salt to the water
(c) Decreasing the volume of the vessel to one-half
(d) Decreasing the temperature of the water
The correct choice among the above is -
1. (a, b)
2. (b, c)
3. (c, d)
4. (b, d)
A gas deviates most from the ideal behaviour under -
(a) Low pressure
(b) High pressure
(c) Low temperature
(d) High temperature
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
The correct statements among the following regarding gaseous state is -
| (a) | Complete order of molecules |
| (b) | Complete disorder of molecules |
| (c) | Random motion of molecules |
| (d) | Fixed position of molecules |
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, d)
Given below are two statements:
| Assertion (A): | Liquids tend to have a maximum number of molecules at their surface. |
| Reason (R): | Small liquid drops have a spherical shape. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | At the critical temperature, the liquid passes into a gaseous state imperceptible and continuously. |
| Reason (R): | The density of the liquid and gaseous phase is equal to critical temperature. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | Gases do not liquefy above their critical temperature, even on applying high pressure. |
| Reason (R): | Above the critical temperature, the molecular speed is high and intermolecular attractions cannot hold the molecules together because they escape because of high speed. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | The temperature at which the vapor pressure of a liquid is equal to the external pressure is called boiling temperature. |
| Reason (R): | At high altitudes atmospheric pressure is high. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | At constant temperature, pV vs p plot for real gases is not a straight line. |
| Reason (R): | At high pressure, all gases have Z>1 but at an intermediate pressure most gases have Z<1. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Given below are two statements:
| Assertion (A): | Three states of matter are the result of a balance between intermolecular forces and the thermal energy of the molecules. |
| Reason (R): | Intermolecular forces tend to keep the molecules together but the thermal energy of molecules tends to keep them apart. |
| 1. | Both (A) and (R) are true and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are true but (R) is not the correct explanation of (A). |
| 3. | (A) is true but (R) is false. |
| 4. | (A) is false but (R) is true. |
Match the following graphs of an ideal gas with their coordinates.
|
Graphical representation |
X and Y coordinates |
|
A. |
1. pV vs V |
|
B. |
2. p vs V |
|
C. |
3. p vs |
Codes
| Options: | A | B | C |
| 1. | 2 | 3 | 1 |
| 2. | 1 | 2 | 3 |
| 3. | 3 | 2 | 1 |
| 4. | 1 | 3 | 1 |
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