JEE Main 2023Chemistryd and f Block ElementsHardMCQ

JEE Main 2023 — d and f Block Elements Question with Solution

JEE Main 2023 (01 Feb Shift 2)

Question

Which element is not present in Nessler’s reagent?

Choose an option

Show full solutionCorrect option: D
Correct answer
DOxygen

Step-by-step explanation

Nessler’s reagent, K2HgI4 is used to detect ammonia. It is a pale solution that gets darker yellow when some amount of ammonia is added. A brown precipitate may form at a higher concentration. Nessler's reagent can be crystallized from a concentrated solution of mercury iodide with potassium iodide.

So, the correct option is D.

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the d and f Block Elements chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2023, covering the d and f Block Elements chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.