Question

Identify the ionic charge and magnetic nature respectively of manganate ion.

• A. -1, Diamagnetic
• B. -2, Diamagnetic
• C. -2, Paramagnetic
• D. -1, Paramagnetic

Hint:

Ionic charge and magnetic nature can be determined by the oxidation state of the metal and the presence of unpaired electrons in the metal’s d-orbitals. Manganate is paramagnetic due to the unpaired electrons in Mn\(^{+6}\).

Answer 1

The Correct Option is C

Step 1: Understanding manganate ion.
Manganate (\( \text{MnO}_4^{2-} \)) is a tetrahedral ion in which manganese is in the +6 oxidation state. The magnetic behavior of manganate is determined by the presence of unpaired electrons in the 3d orbitals of manganese.
Step 2: Analyzing the options.
(A) -1, Diamagnetic: The charge is not -1, and manganate is not diamagnetic.
(B) -2, Diamagnetic: While the charge is -2, manganate is paramagnetic, not diamagnetic.
(C) -2, Paramagnetic: This is correct. Manganate has a charge of -2 and is paramagnetic due to unpaired electrons in the Mn \(3d\) orbitals.
(D) -1, Paramagnetic: The charge is incorrect.
Step 3: Conclusion.
The correct answer is (C) -2, Paramagnetic, as the manganate ion has a charge of -2 and is paramagnetic.