Published by:
CGP EDU Academic Team
Published on: August 12, 2026
The Lassaigne’s extract is boiled with conc. 
while testing for halogens.
By doing so it
A
decomposes 
and NaCN, formed
and NaCN, formed
B
helps in the precipitation of 
C
increases the solubility product of 
D
increases the concentration of 
ions
ions
Text Solution
Verified by ExpertsThe correct answer is:
A
In case of Lassaigne’s test of halogens, it is necessary to remove sodium
cyanide and sodium sulphide from the sodium extract if nitrogen and sulphur are present. This is done by boiling the sodium extract with conc. 
NaCN 
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