Chemistry Question from JEE Main 2026 · 24 January, Shift 2

Molar conductivity of a weak acid HQ of concentration $0.18 \, \text{M}$ was found to be $\dfrac{1}{30}$ of the molar conductivity of another weak acid HZ with concentration $0.02 \, \text{M}$. If $\lambda^\circ_{Q^-}$ happened to be equal to $\lambda^\circ_{Z^-}$, then the difference of the $\text{p}K_a$ values of the two weak acids ($\text{p}K_a(\text{HQ}) - \text{p}K_a(\text{HZ})$) is _____ (Nearest integer).

(Given: degree of dissociation $\alpha \ll 1$ for both weak acids, $\lambda^\circ$ : limiting molar conductivity of ions)