For an exothermic reaction, E_a(forward) = 60 kJ/mol and Delta H = -40 kJ/mol. Select the correct statements.

On raising the temperature, k_r increases by a larger factor than k_f

The slope of ln K versus 1/T is positive

On raising the temperature, k_r increases by a larger factor than k_f

K = k_f/k_r increases on heating

The slope of ln K versus 1/T is positive

JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ce218

For an exothermic reaction, $E_{a} (forward) = 60 kJ/mol$ and $Δ H = - 40 kJ/mol$ . Select the correct statements.

E_{a} (rev) = E_{a} (fwd) - Δ H = 60 + 40 = 100 kJ/mol

, so (A) is false. The larger

E_{a}

makes

k_{r}

more temperature-sensitive (B true), so

K = k_{f} / k_{r}

decreases on heating (C false). The slope of

ln K

1/ T

- Δ H / R = + 40000/8.314 > 0

(D true).