JEE Main · 2026 · 21 Jan 2026 · Shift 2 · d and f Block Elements

In ${\mathrm{Mn}}_2{\mathrm{O}}_7$ manganese is in the $+7$ state, the highest it reaches, so the statement on highest oxidation state holds. This high state is achieved because oxygen forms multiple ($\pi$) bonds to manganese and so stabilises it, supporting the statement on multiple bonding. The oxide is a covalent, unstable green oil rather than an ionic solid, so the statement calling it ionic is wrong. Its structure is two tetrahedral ${\mathrm{MnO}}_3$ units joined through a single bridging oxygen, ${\mathrm{O}}_3{\mathrm{Mn}-\mathrm{O}-\mathrm{MnO}}_3$, so the statement on one bridging oxygen holds. The correct statements are those on the highest oxidation state, oxygen's stabilising multiple bonding, and the single bridging oxygen.