9.29     Amongst the following ions which one has the highest magnetic moment value?

                 (i)[Cr(H_{2}O)_{6}]^{3+}            (ii)[Fe(H_{2}O)_{6}]^{2+}            (iii)[Zn(H_{2}O)_{6}]^{2+}
                

Answers (1)

(i) No. of unpaired electrons in [Cr(H_{2}O)_{6}]^{3+} is 3.

                 The magnetic moment is given by : 

                                                                          =\ \sqrt{n(n+2)}

or                                                                       =\ \sqrt{3(3+2)}\ =\ \sqrt{15}BM

(ii) Similarly in   [Fe(H_{2}O)_{6}]^{2+} the number of unpaired electrons is 4.

                 So the magnetic moment : 

                                                              =\ \sqrt{4(4+2)}\ =\ \sqrt{24}BM

(iii) In the case of    [Zn(H_{2}O)_{6}]^{2+}   the number of unpaired electrons is 0. So its magnetic moment is also zero.

Thus   [Fe(H_{2}O)_{6}]^{2+}  has the highest dipole moment among all.

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