$A$ substance contains an $M^{3+}$ ion with the electronic configuration $[Ar]3d^1$. The ion is........

Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest $E^{o}_{M^{3+} / M^{2+}}$ value?

Which element from the following does $NOT$ exhibit a spin-only magnetic moment in the $+3$ oxidation state?

Which of the following pairs has a similar magnetic moment?

What should be the difference in atomic radii of metals to form an alloy?

Which of the following represents the correct order of the given properties?