In the detection of \( \mathrm{N} \) by Lassaignes test which of the following compounds are for...

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In the detection of \( \mathrm{N} \) by Lassaignes test which of the following compounds are formed during this test?
(a) \( \mathrm{Fe}(\mathrm{OH})_{2} \)
(b) \( \mathrm{Na}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right] \)
(c) \( \mathrm{FeCl}_{3} \)
(d) \( \mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3} \)
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