Statement I: If the intermolecular attraction between gas molecules in a vessel of fixed volume vanishes at constant temperature, the pressure of gas will increase. Statement II: The speed at which th

Question

Statement I: If the intermolecular attraction between gas molecules in a vessel of fixed volume vanishes at constant temperature, the pressure of gas will increase. Statement II: The speed at which the gas molecules are colliding at the walls will increase on disappearance of attractive forces.

Prashant Kotian · Accepted Answer

Correct answer: C. Intermolecular attractive forces pull molecules together, reducing their impact force on the walls. If these attractions vanish, the molecules strike the walls with full momentum, increasing the pressure (Statement I is correct). However, the average speed of the molecules depends only on temperature and does not change when intermolecular forces disappear. Thus, Statement II is incorrect.

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