Which statements about the Arrhenius equation $k = A e^{- E_{a} / RT}$ are correct (treat $A$ and $E_{a}$ as temperature independent)?

AA plot of $ln k$ against $1/ T$ is a straight line with a negative slope
BAs $T \to \infty$ , $k \to A$
CA reaction with larger $E_{a}$ shows a larger relative increase in $k$ for the same rise in temperature
DA catalyst changes $Δ H$ of the reaction by changing $E_{a}$

Answer: A, B, C

ln k = ln A - E_{a} / RT

is linear in

1/ T

with slope

- E_{a} / R < 0

. Since

d ln k / d T = E_{a} / R T^{2}

, larger

E_{a}

gives larger sensitivity. As

T \to \infty

the exponential tends to 1 so

k \to A

. A catalyst lowers

E_{a}

but leaves

Δ H

unchanged, so the third statement is false.