wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

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 C NaCN 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.

flag
Suggest Corrections
thumbs-up
3
Join BYJU'S Learning Program
Join BYJU'S Learning Program
CrossIcon