The Lassaigne’s extract is boiled with conc. HNO3 before testing for halogens because:
A
AgCN is soluble in HNO3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Silver halides are soluble in HNO3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
NaCN and Na2S are decomposed by HNO3
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Ag2S is soluble in HNO3
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution
The correct option is CNaCN and Na2S are decomposed by HNO3 The Lassaigne’s extract is boiled with conc. HNO3 before testing for halogens because the cyanide and sulphide ions present in the extract will interfere in the detection of halogens.
These ions should be removed by boiling the sodium fusion extract with concentrated nitric acid which will decompose the cyanide or sulphide.