Magnetic moment increases with the increase in the number of unpaired electron. In +3 3 6 [Cr(NH ) ] Cr is present in +3 oxidation state and will have 3 unpaired electrons. In 3- 6 [Fe(CN) ] one unpaired electron is present and in 4- +2 6 3 6 [Fe(CN) ] &[Zn(NH ) ] unpaired electrons is absent. Therefore +3 3 6 [Cr(NH ) ] has the highest magnetic moment. Hence, the correct option is (a).
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