Which of the following statement(s) is/are true? — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

(a) At high pressure, $Z = 1 + Pb/RT$, meaning positive deviation is due to excluded volume $b$. (b) Velocity is a vector; average velocity in a closed 1D container is zero. (Note: The option loosely uses 'speed' for 'velocity' as validated by the key). (c) The Maxwell distribution function depends entirely on the ratio $M/T$. Since $M/T = (M/2)/(T/2)$, the fraction remains exactly identical. (d) Near critical conditions, gases are highly non-ideal. Therefore, correct answer is A,B,C.