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Why conc. nitric acid is added to Lassaigne’s filtrate before detecting halogens?
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a
as to decompose Na2S and NaCN
b
as to decompose NaCN and Na2O
c
as to decompose NaCl and NaBr
d
as to decompose NaBr and NaI
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Correct option is A
Before detecting halogens; conc. HNO3 is added to Lassaigne’s filtrate to decompose NaOH and Na2S.HNO3+NaCN→NaNO3+HCN2HNO3+Na2S→2NaNO3+H2STalk to our academic expert!
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