Question:
For testing halogens in an organic compound with AgNO3 solution, sodium extract (Lassaigne’s test) is acidified with dilute HNO3. What will happen if a student acidifies the extract with dilute H2 SO4 in place of dilute HNO3?
Solution:
If dilute H2 SO4is added then sodium sulphide and sodium cyanine are not decomposed thereby we will not get the correct result if halides are also present.