A complex of a certain metal ion has a magnetic moment of `4.90BM` Another complex of the same metal ion in the same oxidation state has zero magnetic moment The central metal ion could be which of the following (a) `Cr^(3+)` ,(b) `Mn^(3+)` (c ) `Fe^(2+)`

Explanation

To solve the problem, we need to analyze the magnetic moments of the given metal ions in their respective oxidation states. The magnetic moment can be calculated using the formula:

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

where \( n \) is the number of unpaired electrons.

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