Question
What is Nesslert’s reagent.

Answer

$1.$ Nessler's reagent is a solution of mercury$(II)$ iodide $(HgI2)$ in potassium iodide$ (KI)$ and potassium hydroxide $(KOH)$ named after the German chemist Julius Nessler
$2.$ Nessler’s reagent is an alkaline solution of $K_2 HgI_{4}$
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$3.$ It is used in testing for ammonia, with which it forms a brown coloration or precipitate.

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