Q. The function of boiling the sodium extract with conc. $HNO_{3}$ before testing for halogen is
A) To make the solution acidic
B) To make the solution clear
C) To convert $Fe^{2 +}$ to $Fe^{3 +}$
D) To destroy $CN^{-}$ and $S^{2 -}$ ions
Explanation
The correct answer is Option D: To destroy $CN^{-}$ and $S^{2 -}$ ions.
A detailed explanation for this question is being prepared.
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.