JEE Chemistry 2026 Question with Solution

Given: Statements about manganate and permanganate ions are to be checked.

Find: Which statements are correct.

Step 1: Geometry Both $\mathrm{MnO_4^{2-}}$ (manganate) and $\mathrm{MnO_4^-}$ (permanganate) have tetrahedral geometry. So, statement A is correct.

Step 2: Oxidation states In $\mathrm{MnO_4^{2-}}$, manganese oxidation state is $+6$. In $\mathrm{MnO_4^-}$, manganese oxidation state is $+7$. Therefore, statement B is correct.

Step 3: Oxidation by peroxodisulphate Mn(II) salts oxidize to permanganate, not manganate. So, statement C is false.

Step 4: Magnetic properties Manganate ion with Mn in oxidation state $+6$ has $d^1$ electronic configuration and is paramagnetic. Permanganate ion with Mn in oxidation state $+7$ has $d^0$ electronic configuration and is diamagnetic. So, statement D is correct.

Step 5: Redox properties Acidified permanganate ion is a strong oxidizing agent and oxidizes oxalate, nitrite, and iodide ions. So, statement E is correct.

Thus, the correct statements are A, B and E. Therefore, the correct option is D.