\(1\) mole of an ideal gas is contained in a cubical volume V, ABCDEFGH at \(300\) K (figure). One face of the cube (EFGH) is made up of a material which totally absorbs any gas molecule incident on it. At any given time:
| 1. | the pressure on EFGH would be zero. |
| 2. | the pressure on all the faces will be equal. |
| 3. | the pressure on EFGH would be double the pressure on ABCD. |
| 4. | the pressure on EFGH would be half that on ABCD. |
