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NCERT Class XII Chemistry
Chapter - The d- and f-Block Elements
Questions with Solutions

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Question : 46 of 49
Marks: +1, -0
Calculate the ‘spin only’ magnetic moment of M2+^{2+}(aq)_{\mathrm{(aq)}} ion (Z = 27).
Solution:  
Z = 27
Electronic configuration of M2+^{2+} is 3d7^{7}
No. of unpaired electrons = 3
μ=n(n+2)\mu=\sqrt{n(n+2)}
=3(3+2)=\sqrt{3(3+2)}
=15=\sqrt{15}
=3.87 BM=3.87\,\mathrm{BM}
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