What is the spin-only magnetic moment value (B.M) of a divalent metal ion with atomic number 25, in it's aqueous solution ?
A
5.92
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B
5.26
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C
Zero
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D
5.0
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Solution
The correct option is A 5.92 The element having atomic number 25 is manganese. The electronic configuration of Mn2+ is : Mn2+:[Ar]3d5
In aqueous solution it exists as [Mn(H2O)6]2+ . Since H2O is a weak field ligand, it does not cause pairing of unpaired electrons .
So , its spin only magnetic moment is