A) \[F{{e}_{4}}{{[Fe(C{{N}_{6}})]}_{3}}\]
B) \[N{{a}_{3}}[Fe{{(CN)}_{6}}]\]
C) \[Fe{{(CN)}_{3}}\]
D) \[N{{a}_{4}}[Fe{{(CN)}_{5}}COS]\]
Correct Answer: A
Solution :
\[3N{{a}_{4}}[Fe{{(CN)}_{6}}]+4F{{e}^{3+}}\xrightarrow{{}}\] \[\underset{\begin{smallmatrix} \text{Iron}\,\,\text{(III)}\,\,\text{hexacyanoferrate}\,\,\text{(II)} \\ \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,(Prussian\,\,blue) \end{smallmatrix}}{\mathop{F{{e}_{4}}{{[Fe{{(CN)}_{6}}]}_{3}}+12N{{a}^{+}}}}\,\] Appearance of blue or green colour by using Lassaignes extract indicates the presence of nitrogen.
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