Formulae for Nessler’s reagent is: — Solution | JEE Chemistry

MCQEasyJEE 2023Ligands & Coordination Number

Formulae for Nessler’s reagent is:

Answer

Correct answer:C

Standard Method

Given: The question asks for the formula of Nessler’s reagent.

Find: The correct chemical formula among the given options.

From the provided solution, Nessler's reagent is $K_2HgI_4$ .

Therefore, the correct option is C.

Confusing Nessler’s reagent with mercuric iodide alone is incorrect because $HgI_2$ is only a component, not the full reagent. Use the complete formula of the reagent instead.
Choosing $KHgI_2$ or $KHgI_3$ by pattern matching is incorrect because coordination compound formulae must match the known composition exactly. Memorize the standard reagent formula as $K_2HgI_4$ .

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