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  3. Chemistry
  4. . The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of:

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Q. . The Prussian blue colour obtained during the test of nitrogen by Lassaigne's test is due to the formation of:

Organic Chemistry – Some Basic Principles and Techniques

Solution:

$Fe ^{3+}+\left[ Fe ( CN )_6\right]^{4-} \rightarrow Fe _4\left[ Fe ( CN )_6\right]_3$
Prussian blue (Ferri-ferrocyanide)