JEE Advanced 2015 · Paper 1 · Chemistry Q37

ChemistryMultiple correct+4 / -2Question 37 of 60

The %yield of ammonia as a function of time in the reaction
$\ce{N2(g) + 3H2(g) <=> 2NH3(g)},\quad\Delta H<0$
at $(P,T_1)$ is given below.

If this reaction is conducted at $(P,T_2)$ , with $T_2>T_1$ , the %yield of ammonia as a function of time is represented by

Answer and worked solution

Official answer: B

Rate. At $T_2>T_1$ the reaction is faster, so the curve rises more steeply.

Yield. The reaction is exothermic, so the equilibrium yield is lower at the higher temperature.

That is graph (B): faster rise, lower plateau.

(B)

Topics:Le Chatelier's principle Arrhenius equation

JEE Advanced 2015 · Paper 1, Chemistry question 37