Question

The d-electron configurations of Cr²⁺, Mn²⁺, Fe²⁺ and Co²⁺ are d⁴, d⁵, d⁶ and d⁷ respectively. Which one of the following will exhibit minimum paramagnetic behaviour?

(At. no. Cr = 24, Mn = 25, Fe = 26, Co = 27)

पर्याय

• [Fe(H₂O)₆]²⁺

• [Co(H₂O)6]²⁺

• [Cr(H₂O)₆]²⁺

• [Mn(H₂O)₆]²⁺

Answer 1

[Co(H₂O)6]²⁺

Explanation:

The complex [Co(H₂O)6]²⁺ exhibits the minimum paramagnetic behavior because Co²⁺ (d⁷) has 3 unpaired electrons. Other complexes have more unpaired electrons, making them more paramagnetic.