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  4. Which of the following graphs represents an exothermic reaction?

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Q. Which of the following graphs represents an exothermic reaction?

NTA AbhyasNTA Abhyas 2020Equilibrium

Solution:

According to van't Hoff equation

$logK=\left[- \frac{\Delta H ^\circ }{2.303 R}\right]\times \frac{1}{T}+\frac{\Delta S ^\circ }{R}$

$Y=M \, x+C$

When log K is plotted against $\frac{1}{T}$ , we get straight line having slope equal to $\left[- \frac{\Delta H ^\circ }{2.303 R}\right]$

For exothermic reaction, slope of the line will be positive.