Question

The pair having the same magnetic moment is ______.

[At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]

विकल्प

• [Cr(H₂O)₆]²⁺ and [CoCl₄]²⁻

• [Cr(H₂O)₆]²⁺ and [Fe(H₂O)₆]²⁺

• [Mn(H₂O)₆]²⁺ and [Cr(H₂O)₆]²⁺

• [CoCl₄]²⁻ and [Fe(H₂O)₆]²⁺

Answer 1

The pair having the same magnetic moment is `bbunderline([Cr(H_2O)_6]^(2+) and [Fe(H_2O)_6]^(2+))`.

Explanation:

• [Cr(H₂O)₆]²⁺: Cr²⁺ has a d⁴ configuration, leading to 4 unpaired electrons.
• [Fe(H₂O)₆]²⁺: Fe²⁺ has a d⁶ configuration and also results in 4 unpaired electrons in a high-spin octahedral complex.

Thus, both complexes have the same number of unpaired electrons (4), so their magnetic moments are the same, approximately 4.9 BM.