Question

Which factor, when decreased will cause a reaction to proceed more quickly?

• A. Exothermic
• B. Particle Size
• C. Endothermic
• D. Catalyst
• E. Concentration

Answer 1

The correct option is A Exothermic

By van't Hoff equation,

$\frac{dlnk}{dT}=\frac{{△H}^0}{{RT}^2}$

Now, if ${△H}^0>0$ (endothermic reaction), $\frac{dlnk}{dT}=+ve$. So, $Kp$ increases with increase of temperature. So, for exothermic reactions, it will decrease with increase of temperature. So, to proceed the reaction more quickly, exothermic nature of the reaction should be decreased. These observations can also be predicated by Le-chatclier's principle.