Q20. The pair in which both the species have the same magnetic moment (spin only value) is:
(a) [Cr(

Q: What is the correct answer for CUET UG Chemistry (Coordination Compounds) Q20?

The correct answer is b. [Cr(H2O)6]2+ and [Fe(H2O)6]2+ have same magnetic moment as both Cr2+ and Fe2+ have same number of unpaired electrons.Cr2+: [Ar]3d4, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Fe2+: [Ar]3d6, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Since both have 4 unpaired electrons, their spin-only magnetic moment (μ = √n(n+2)) will be the same.

Q: Q20. The pair in which both the species have the same magnetic moment (spin only value) is: (a) [Cr(H2O)6]2+, [CoCl4]2- (b) [Cr(H2O)6]2+, [Fe(H2O)6]2+ (c) [Mn(H2O)6]2+, [Cr(H2O)6]2+ (d) [CoCl4]2-,…

The correct answer is b. [Cr(H2O)6]2+ and [Fe(H2O)6]2+ have same magnetic moment as both Cr2+ and Fe2+ have same number of unpaired electrons.Cr2+: [Ar]3d4, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Fe2+: [Ar]3d6, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Since both have 4 unpaired electrons, their spin-only magnetic moment (μ = √n(n+2)) will be the same.

Q: What are the options for this CUET UG Chemistry (Coordination Compounds) question?

A. [Cr(H2O)6]2+, [CoCl4]2- · B. [Cr(H2O)6]2+, [Fe(H2O)6]2+ · C. [Mn(H2O)6]2+, [Cr(H2O)6]2+ · D. [CoCl4]2-, [Fe(H2O)6]2+

Question

Q20. The pair in which both the species have the same magnetic moment (spin only value) is:
(a) [Cr(H2O)6]2+, [CoCl4]2-
(b) [Cr(H2O)6]2+, [Fe(H2O)6]2+
(c) [Mn(H2O)6]2+, [Cr(H2O)6]2+
(d) [CoCl4]2-, [Fe(H2O)6]2+

FirstInTest · Accepted Answer

[Cr(H2O)6]2+ and [Fe(H2O)6]2+ have same magnetic moment as both Cr2+ and Fe2+ have same number of unpaired electrons.Cr2+: [Ar]3d4, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Fe2+: [Ar]3d6, H2O is a weak field ligand, so high spin. 4 unpaired electrons.Since both have 4 unpaired electrons, their spin-only magnetic moment (μ = √n(n+2)) will be the same.

Answer

[Cr(H2O)6]2+, [CoCl4]2-

Answer

[Cr(H2O)6]2+, [Fe(H2O)6]2+

Answer

[Mn(H2O)6]2+, [Cr(H2O)6]2+

Answer

[CoCl4]2-, [Fe(H2O)6]2+

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