JEE MAIN - Chemistry (2016 (Offline) - No. 15)
The pair having the same magnetic moment is :
[At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]
[At. No.: Cr = 24, Mn = 25, Fe = 26, Co = 27]
[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+
[Cr(H2O)6]2+ and [CoCl4]2–
Selitys
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Since $$(a)$$ and $$(b),$$ each has $$4$$ unpaired electrons, they will have same magnetic moment.