Amongst the following ions, which one has the highest magnetic moment
`[Cr(H_(2)O)_(6)]^(3+)`
`[Fe(H_(2)O)_(6)]^(2+)`
`[Zn(H_(2)O)_(6)]^(2+)`

Explanation

To determine which of the given ions has the highest magnetic moment, we need to analyze the number of unpaired electrons in each complex ion. The magnetic moment (\( \mu \)) can be calculated using the formula:

\[ \mu = \sqrt{n(n + 2)} \]

where \( n \) is the number of unpaired electrons. The more unpaired electrons an ion has, the higher its magnetic moment will be.

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