Chemistry Question from JEE Main 2026 · 21 January, Shift 2

MX is a sparingly soluble salt that follows the given solubility equilibrium at $298 \, \text{K}$.

MX(s) $\rightleftharpoons$ M^{+}(aq) + X^{-}(aq); $K_{sp} = 10^{-10}$

If the standard reduction potential for $M^{+}(aq) + e^{-} \rightarrow M(s)$ is $(E^{\circ}_{M^{+}/M}) = 0.79 \, \text{V}$, then the value of the standard reduction potential for the metal/metal insoluble salt electrode $E^{\circ}_{X^{-}/MX(s)/M}$ is _____ mV. (nearest integer)

[Given : $\frac{2.303 RT}{F} = 0.059 \, \text{V}$]