Which of the following statements about the gaseous state of matter is not correct? The molecules of a substance is in gaseous state
are in constant state of motion
have different speed
have a temperature which is an average measure of the kinetic energy
have no intermolecular attractive force
have a pressure which is determined by the number of molecules present
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The correct answer is option 'D' pressure of a gas is not determined by the number of molecules present but rather the number of collisions between the molecules of the gas and its container
A. Are in constant state of motion: This is true. Gas molecules are in constant random motion.
B. Have different speed: This is true. Gas molecules move at different speeds, with the average speed increasing with temperature.
C. Have a temperature which is an average measure of the kinetic energy: This is true. Temperature is a measure of the average kinetic energy of the gas molecules.
D. Have no intermolecular attractive force: This is not true. Gas molecules have weak intermolecular forces, they are not completely absent.
E. Have a pressure which is determined by the number of molecules present: This is true because the pressure of a gas is directly proportional to the number of gas molecules colliding in the container.
So therefore, option D is the answer
