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NCERT Class XII Chemistry
Chapter - Coordination Compounds
Questions with Solutions

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Question : 29 of 43
Marks: +1, -0
Amongst the following ions which one has the highest magnetic moment value?
(a) [Cr(H2O)6]3+[Cr(H_2O)_6] ^{3+}
(b) [Fe(H2O)6]2+[Fe(H_2O)_6] ^{2+}
(c) [Zn(H2O)6]2+[Zn(H_2O)_6] ^{2+}
Solution:  
(b) : Cr3+–3d3Cr^{3+} – 3d^{3},
Fe2+–3d6Fe^{2+} – 3d^{6},
Zn2+–3d10Zn^{2+} – 3d^{10}
Since Fe2+Fe^{2+} has 4 unpaired electrons, it has highest magnetic moment.
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