JEE Main · 2023 · 01 Feb 2023 · Shift 1 · d and f Block Elements

In $\mathrm{M}{\mathrm{n}}_2{\mathrm{O}}_7$ manganese is in its highest oxidation state, $+7$. The molecule is built from two $\mathrm{Mn}{\mathrm{O}}_4$ tetrahedra joined through a shared corner oxygen, so each manganese is surrounded tetrahedrally by four oxygens and the two units are linked by an $\mathrm{Mn}-\mathrm{O}-\mathrm{Mn}$ bridge. There is no direct manganese-manganese bond and the coordination is not octahedral. The correct descriptions are the tetrahedral surrounding of manganese and the presence of the oxygen bridge.