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Which of the following ions has the highest magnetic moment ?

$(a)\;Mn^{3+}\qquad(b)\;Zn^{2+}\qquad(c)\;Sc^{3+}\qquad(d)\;Ti^{3+}$

$Mn^{3+}$ has five unpaired electron. Rest all possess either no unpaired electrons ($Sc^{3+},Zn^{2+}$) or have one unpaired electron ($Ti^{3+})$
Hence (a) is the correct answer.
edited Apr 2, 2014