Statement I: At 273 K, hydrogen and helium gases have positive slope at all pressure in PV vs P grap — States of Matter and Gaseous State Chemistry Question

💡 Solution & Explanation

At 273 K, $H_2$ and He are above their Boyle temperatures (which are 110 K and 22 K, respectively). Above Boyle's temperature, the repulsive forces dominate, meaning Z > 1 and the slope of the PV vs P plot is positive at all pressures. Thus, Statement II is the correct explanation for Statement I.