The metal complex that is diamagnetic is (Atomic number: $\mathrm{Fe}, 26 ; \mathrm{Cu}, 29)$

Question

$\mathrm{K}_{3}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$

$\mathrm{K}_{2}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]$

$\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{4}\right]$

$\mathrm{K}_{4}\left[\mathrm{FeCl}_{6}\right]$

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