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When \( \mathrm{HNO}_{3} \) is added to sodium ferrocyanide, which of the following observation is observed ?
P
(a) \( \mathrm{NaFe}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \) is produced.
W)
(b) \( \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3} \) is formed.
(c) \( \mathrm{Fe}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{2} \) is formed.
(d) \( \mathrm{Na}_{2}\left[\mathrm{Fe}(\mathrm{CN})_{5}(\mathrm{NO})^{+}\right]^{2-} \) is formed.
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