JEE Main Chemistry question

The Lassaigne's extract is boiled with conc. HNO₃ while testing for halogens. By doing so it

(A)Increases the concentration of NO₃⁻ ions
(B)Decomposes Na₂S and NaCN, if formedCorrect
(C)Helps in the precipitation of AgCl
(D)Increases the solubility product of AgCl

Answer: (B)

Solution

Sodium fusion can also produce Na₂S and NaCN (from S and N in the sample) alongside the sodium halide. Both Na₂S and NaCN would themselves form precipitates with AgNO₃ (Ag₂S and AgCN) that could be mistaken for AgX,

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Question ID VK-149537