The magnetic behaviour of manganate ion and permanganate ions, respectively, are

paramagnetic and diamagnetic

The correct answer is Option (3) → paramagnetic and diamagnetic

Manganate ion, MnO₄²⁻

• Oxidation state of Mn = +6
• Mn atomic number = 25
• Mn⁶⁺ configuration: 3d¹
• Since there is one unpaired electron, it is paramagnetic.

Permanganate ion, MnO₄⁻

• Oxidation state of Mn = +7
• Mn⁷⁺ configuration: 3d⁰
• No unpaired electrons → diamagnetic

So the answer is Option (3)

• Manganate ion → Paramagnetic
• Permanganate ion → Diamagnetic