Which one of the following complexes is violet in colour? (a) \( \left[\mathrm{Fe}(\mathrm{CN})_...

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Which one of the following complexes is violet in colour?
(a) \( \left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{4-} \)
(b) \( \left[\mathrm{Fe}(\mathrm{SCN})_{6}\right]^{4} \)
(c) \( \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3} \cdot \mathrm{H}_{2} \mathrm{O} \)
(d) \( \left[\mathrm{Fe}(\mathrm{CN})_{5} \mathrm{NOS}^{4}\right. \)
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