Blood-red colour in the detection of both \( \mathrm{N} \) and \( \mathrm{S} \) in Lassaigne's e....

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Blood-red colour in the detection of both \( \mathrm{N} \) and \( \mathrm{S} \) in
\( \mathrm{P} \)
Lassaigne's extract is due to the formatin of:
(1) \( \mathrm{Fe}(\mathrm{CNS})_{2} \)
(2) \( [\mathrm{Fe}(\mathrm{SCN})]^{2+} \)
(3) \( \mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(4) \( \mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)


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