Question

An exothermic reaction is represented by the graph :

• A.
• B.
• C.
• D.

Answer 1

The correct option is C

The Van't Hoff equation is given by:
$ln{K}_p=-\frac{\Delta H^o}{RT}+\frac{\Delta S^o}{R}$
For an exothermic reaction, $\Delta H^o$ is negative. and hence
$ln{K}_p=\frac{\Delta H^o}{RT}+\frac{\Delta S^o}{R}$
The Van't Hoff equation can be compared with the straight line equation $y=mx+c$.
Hence the slope of $lnKpvs\frac{1}{T}$​ graph is positive and is constant.