Question

Nessler's reagent is

• A. $KHgI_{4}$
• B. $K_{2}HgI_{4}+NH_{4}OH$
• C. $[Ne]3s^{2}3p^{3}$
• D. $KHgI_{4}+NH_{4}OH$

Answer 1

Answer: (C)

$[Ne]3s^{2}3p^{3}$

Answer 2

Nessler's reagent $= K _{2} HgI _{4}+ KOH$ $2 K _{2} HgI _{4}+ NH _{4} Cl +4 KOH \rightarrow \underset{\text{iodide of Million's base (brown ppt) }}{NH _{2} HgOHgI}$ $+7 KI + KCl +3 H _{2} O$ Nessler's reagent is required for detection of ammonia. It gives brown ppt with ammonium salt.