During Lassaigne's test for nitrogen, a Prussian blue colour is observed. Which of the following com — Qualitative and Quantitative Analysis Chemistry Question
Question
During Lassaigne's test for nitrogen, a Prussian blue colour is observed. Which of the following compounds will **fail** to give a positive Lassaigne's test for nitrogen?
Answer: C
💡 Solution & Explanation
Lassaigne's test relies on fusing the compound with sodium to form $NaCN$. The compound must therefore contain both Carbon and Nitrogen. Hydrazine ($NH_2NH_2$) lacks carbon and cannot form the cyanide ion.
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