Which ion is the most strongly paramagnetic?
Correct answer C. Mn²⁺
Explanation
Paramagnetism increases with the number of unpaired electrons. Mn²⁺ (3d⁵) has 5, Fe²⁺ (3d⁶) has 4, Co²⁺ (3d⁷) has 3 and Ni²⁺ (3d⁸) has 2, so Mn²⁺ is the most paramagnetic.
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