JEE Main 2017 · 8 Apr · Shift 1 · Chemistry Q34

ChemistrySingle correct+4 / -1Question 34 of 90

For a reaction, $\ce{A(g) -> A(l)}$ ; ΔH = −3RT. The correct statement for the reaction is :

\Delta H=\Delta U\ne0

\Delta H=\Delta U=0

|\Delta H|<|\Delta U|

|\Delta H|>|\Delta U|

Answer and worked solution

Official answer: D

$\Delta H=\Delta U+\Delta n_gRT$ with $\Delta n_g=-1$ , so $\Delta U=-3RT+RT=-2RT$ . Then $|\Delta H|=3RT>|\Delta U|=2RT$ .

JEE Main 2017 · 8 Apr · Shift 1, Chemistry question 34