Why conc. nitric acid is added to Lassaigne’s filtrate before detecting halogens?
as to decompose Na2S and NaCN
as to decompose NaCN and Na2O
as to decompose NaCl and NaBr
as to decompose NaBr and NaI
Before detecting halogens; conc. HNO3 is added to Lassaigne’s filtrate to decompose NaOH and Na2S.