Which of the following plots represents an exothermic reaction?

Question

Professor PC Thomas Classes · Answer

(a) : We have the following relationship.
$
\ln K_p=-\frac{\Delta H}{R T}+	ext { constant }
$
Now, if $\Delta H$ is -ve, then the relation comes out to be :
$\ln K_p=\frac{\Delta H}{R T}+$ constant
$	herefore \ln K_p$ vs $\frac{1}{T}$ graph is similar to
$y=m x+c$ where, $m$ and $c$ both are positive. So, the graph will be as shown: