Chemistry - Ideal Gas Question with Solution | TestHub

For a fixed amount of ideal gas: $V$ = $nRT$/$P$, $P$ = $nRT$/$V$, $PV$ = $nRT$, $d$ = $PM$/$RT$.

(A) $V$ vs $T$: slope = $nR$/$P$, so a higher pressure gives a flatter line. Arrow toward flatter lines for increasing pressure: correct.

(B) $P$ vs 1/$V$: slope = $nRT$, so a higher temperature gives a steeper line. Arrow toward steeper lines for increasing temp.: correct.

($C$) $PV$ vs $P$: $PV$ = $nRT$ is a horizontal line that rises with $T$. Arrow upward for increasing temp.: correct.

(D) $d$ vs $P$: slope = $M$/$RT$, so a larger molar mass gives a steeper line. The arrow points toward flatter lines but is labelled increasing molar mass: incorrectly marked.

Answer: (D).