QJEEM23Ch1110: JEE Main 2023 Chemistry - Class 12 JEEM23Ch1110 Solution: Element not present in Nessler's reagent is :

Nessler's reagent is a 2% solution of potassium tetraiodomercurate(II) in aqueous potassium hydroxide. Its chemical formula is $${\mathrm{K}}_2[{\mathrm{HgI}}_4]$$. The elements present in it are Potassium (K), Mercury (Hg), and Iodine (I). Nitrogen (N) is not present in Nessler's reagent.