Nitrogen detection in an organic compound is carried out by Lassaigne’s test. The blue colour formed corresponds to which of the following formulae?
(a) Fe₃[Fe(CN)₆]₃
(b) Fe₃[Fe(CN)₆]₂
(c) Fe₄[Fe(CN)₆]₃
(d) Fe₄[Fe(CN)₆]₂
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C option
Secret method
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