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The ferrous ion in a given sample is detected by the formation of a white precipitate on the addition of a potassium ferrocyanide solution to it. The precipitate has the constitutional formula.
(a) \( \mathrm{K}_{2} \mathrm{Fe}^{\mathrm{II}}\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{6}\right] \)
(b) \( \mathrm{K}_{2} \mathrm{Fe}^{\mathrm{III}}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(c) \( \mathrm{KFe}^{\mathrm{III}}\left[\mathrm{Fe}^{\mathrm{II}}(\mathrm{CN})_{6}\right] \)
(d) \( \mathrm{KFe}^{\mathrm{II}}\left[\mathrm{Fe}^{\mathrm{III}}(\mathrm{CN})_{6}\right] \)
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