JEE Main 2022 · 25 Jul · Shift 2, Chemistry question 87

The spin-only magnetic moment value of $\mathrm{M^{3+}}$ ion (in gaseous state) from the pairs $\mathrm{Cr^{3+}/Cr^{2+}}$, $\mathrm{Mn^{3+}/Mn^{2+}}$, $\mathrm{Fe^{3+}/Fe^{2+}}$ and $\mathrm{Co^{3+}/Co^{2+}}$ that has negative standard electrode potential, is ______ B.M. [Nearest integer]