question_answer 39)

Amongst the following ions, which one has the highest magnetic moment? (i) [Cr(H2O)6]3+                  (ii)[Fe(H2O)62+ (iii) [Zn(H2O)6]2+

Answer:

The oxidation states are : Cr(III), Fe(II) and Zn(II) E.C. of Cr3+ = 3d3, unpaired electrons = 3               E.C. of Fe2+ = 3d6' unpaired electrons = 4 E.C. of Zn2+ 3d10, unpaired electrons = 0 Magnetic moment,  Hence (ii) has highest magnetic moment.