Question

Which of the following statements is TRUE for gases?

1. The temperature of a gas is inversely proportional to its pressure.
2. The volume of a gas in directly proportional to the pressure in atm.
3. The pressure of a gas is due to collisions of the gas molecules.

A. 1 and 3 only
B. 2 only
C. 1 only
D. 3 only
E. 1 and 2 only

Answer 1

Answer: Option D: 3 only.

Explanation: Statement 1 is incorrect; according to Gay Lussac's law, the relationship between the temperature and pressure of a gas held at a constant volume is directly proportional. Similarly, statement 2 is incorrect because Boyle's Law states that the volume and pressure of a gas held at a constant temperature are inversely proportional. Statement 3 is the only correct option: the pressure of a gas is indeed caused by the collision of particles with objects.