Question

Which of the following statements are in accordance with the Arrhenius equation?
(a) Rate of a reaction increases with increase in temperature
(b) Rate of a reaction increases with a decrease in activation energy
(c) Rate constant decreases exponentially with an increase in temperature
(d) Rate of reaction decreases with a decrease in activation energy

Answer 1

Answers: (a) and (b).

Arrhenius equation can be written as $k=A.e^{\frac{-E_a}{RT}}$
$k\propto e^{-E_a}$ i.e., rate of reaction increases with decrease in activation energy.
$k\propto e^{\frac{-1}{T}}$
$k\propto e^T$ i.e., rate of reaction increases with increase in temperature.

The rate of reaction increases with temperature. It becomes double with every 10° change. It increases with a decrease in activation energy.