Question

Which one of the following is/are correct regarding van't Hoff equation?

• A. For endothermic reaction, van't Hoff plot would always gives positive slope
• B. For endothermic reaction, van't Hoff plot would always gives negative slope
• C. For endothermic reaction, van't Hoff plot can gives both positive and negative slope
• D. None of the above

Answer 1

The correct option is B For endothermic reaction, van't Hoff plot would always gives negative slope

The van't Hoff equation is given by $log\frac{K_{p_2}}{K_{p_1}}=\frac{△H}{2.303R}\left[\frac{T_2-T_1}{T_1{T}_2}\right]$
For endothermic reaction, $△H>0$ since heat will
so, slope = $-\frac{△H}{R}<0$
thus for endothermic reaction, slope will always be negative.