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Ferric ion forms a prussian blue coloured ppt. of :

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$K_{4} [Fe (CN)_{6}]$

${Fe}_{4} {[Fe (CN)_{6}]}_{3}$

$Fe (OH)_{3}$

${KMnO}_{4}$

answer is B.

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Detailed Solution

${Fe}_{4} {[Fe (CN)_{6}]}_{3}$ , a ferric ion-forming compound, precipitates as a Prussian blue substance.

This complex is formed as a result of the test used to assess whether nitrogen is present in the sample. In this procedure, newly made ferrous sulphate, FeSO₄ solution is added to a fraction of sodium fusion extract and warmed.

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