AP EAPCET 23 May 2025 Shift 2 Paper

Let's match the standard electrode potentials $(E_{M^{2+}/M}^{\ominus})$ for the given transition metals. We need to recall the typical values for these elements from the electrochemical series.The standard reduction potentials for the given metals are approximately:Manganese (Mn): $E_{M n^{2+}/M n}^{\ominus}$ is known to be significantly negative, typically $-1.18\,\text{V}$. This is due to its strong tendency to form $\mathrm{Mn}^{2+}$, especially considering the stable half-filled d -subshell $(d^5)$ in $\mathrm{Mn}^{2+}$ after losing two electrons from its $[\mathrm{Ar}]\,3d^5\,4s^2$ configuration.Chromium (Cr): $E_{C r^{2+}/C r}^{\ominus}$ is also quite negative, typically $-0.91\,\text{V}$.Iron (Fe): $E_{F e^{2+}/F e}^{\ominus}$ is moderately negative, typically $-0.44\,\text{V}$.Nickel (Ni): $E_{N i^{2+}/N i}^{\ominus}$ is the least negative among the given options, typically $-0.25\,\text{V}$.