JEE Main 2026 — Jan 28, Shift 2 — Chemistry solution

JEE Main2026Jan 28, Shift 2Chemistry

Consider the following statements about manganate and permanganate ions. Identify the correct statements :

A. The geometry of both manganate and permanganate ions is tetrahedral.

B. The oxidation states of Mn in manganate and permanganate are $+ 7$ and $+ 6$ , respectively.

C. Oxidation of Mn(II) salt by peroxodisulphate gives manganate ion as the final product.

D. Manganate ion is paramagnetic and permanganate ions is diamagnetic.

E. Acidified permanganate ion reduces oxalate, nitrite and iodide ions.

Choose the correct answer from the options given below:

A
A, C and D Only
B
A, B and C Only
C
A, D and E Only
D
A and D Only

Solution

A. Manganate $MnO_{4}^{2 -}$ and permanganate $MnO_{4}^{-}$ both adopt $s p^{3}$ -like geometry (Mn is $d^{3} s$ -hybridised); both are tetrahedral — TRUE.

B. Mn in $MnO_{4}^{2 -}$ is $+ 6$ ; in $MnO_{4}^{-}$ is $+ 7$ . The statement reverses them — FALSE.

C. $Mn^{2 +} + S_{2} O_{8}^{2 -} \to MnO_{4}^{-}$ (permanganate), not manganate — FALSE.

D. $MnO_{4}^{2 -}$ : Mn is $d^{1}$ , one unpaired electron, paramagnetic. $MnO_{4}^{-}$ : Mn is $d^{0}$ , diamagnetic. TRUE.

E. Acidified permanganate is an oxidising agent — it oxidises oxalate, nitrite and iodide (not reduces). FALSE.

$∴$ A and D only.

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