JEE Main 202330 JanuaryEvening Shift

Exam: JEE Main
Year: 2023
Date: 30 January
Shift: Evening Shift
Subject: Chemistry
Chapter: p Block Elements (Group 15, 16, 17 & 18)

JEE Main 2023 · 30 January · Evening Shift · Chemistry · p Block Elements (Group 15, 16, 17 & 18)

Formulae for Nessler's reagent is:

Options

A ${KHg}_{2}{I}_{2}$
B ${KHgI}_{3}$
C ${K}_{2}{HgI}_{4}$
D ${HgI}_{2}$

Correct answer

C. ${K}_{2}{HgI}_{4}$

Step-by-step solution

Nessler's reagent is

{K}_{2}{HgI}_{4}

. Nessler's reagent is an aqueous solution of potassium iodide, mercuric chloride, and potassium hydroxide. It turns into pale brown colour in presence of ammonia.

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