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Increasing order of EAN of the metals in \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \), \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \) and \( \left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-} \) is:
(a) \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-} \)
(b) \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}=\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-} \)
(c) \( \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-} \)
(d) \( \left[\mathrm{Cu}(\mathrm{CN})_{4}\right]^{3-}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-} \)
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