Question

The pair in which both species have same magnetic moment
(spin only value) is :
(a) [Cr(H₂O)₆]²⁺ , [CoCI₄]²⁻
(b) [Cr(H₂O₆ )²⁺ ,[Fe(H₂O)₆ ]²⁺
(c) [Mn(H₂O)₆ ]²⁺ ,[Cr(H₂O)₆ ]²⁺
(d) [CoCl₄ )²⁻ ,[Fe(H₂O)₆ ]²⁺

Answer 1

Answer:

(b) [Cr(H₂O₆ )²⁺ ,[Fe(H₂O)₆ ]²⁺

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Answer 2

The [Cr(H₂O₆ )²⁺ and [Fe(H₂O)₆ ]²⁺ have same magnetic moment.

Explanation:

• The magnetic moment is the property of the complex ions that respond to the magnetic field.

• The magnetic moment is caused by the presence of the unpaired electrons in the central ion of the complex ion.

• The Spin only magnetic moment is measured by √n(n+2) where, n is the number of unpaired electrons.

• The number of unpaired electrons in Cr2+ ([Ar] 3d4) is 4, in Co2+ ([Ar]3d7) is 3, in Fe2+ ([Ar] 3d6) is 4, in Mn2+ ([Ar] 3d5) is 5.  

• The same magnetic moment will be given by ions of same number of unpaired electrons.

• As the number of unpaired electrons in Cr2+ and Fe2+ are same, hence [Cr(H2O)6]2+ and [Fe(H2O)6]2+ will have same magnetic moment.

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