MEDIUMMCQ SINGLEJEE Mains ChemistryInorganic ChemistryCoordination compoundsValence Bond Theory
The pair having the same magnetic moment is: [At, No. : Cr = 24, Mn = 25, Fe = 26, Co = 27]
A.[Cr(H2O)6]2+ and [Fe(H2O)6]2+✓ Correct
B.[Mn(H2O)6]2+ and [Cr(H2O)6]2+
C.[CoCl4]2– and [Fe(H2O)6]2+
D.[Cr(H2O)6]2+ and [CoCl4]2–
Explanation
In 2+ 2 6 [Cr(H O) ] , the chromium metal is present in the oxidation state of +2 and there are 4 unpaired electrons. Similarly, in 2+ 2 6 [Fe(H O) ] the iron metal is present in the oxidation state of +2 having 4 unpaired electrons. Hence, both the complex will have the same magnetic moment. Hence, the correct answer is option (a)
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