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Nessler's reagent is...

Nessler's reagent is

A

`K_(2)HgI_(4)`

B

`K_(2)HgI_(2)`

C

`K_(2)HgCl_(4)`

D

`HgI_(2)`

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Text Solution:** 1. **Understanding Nessler's Reagent**: Nessler's reagent is a chemical compound used primarily in analytical chemistry. It is particularly known for its application in detecting the presence of ammonia in a sample. 2. **Chemical Formula**: The chemical formula for Nessler's reagent is K2HgI4. This indicates that it is composed of potassium (K), mercury (Hg), and iodine (I). 3. **Application**: Nessler's reagent is used in qualitative analysis to identify ammonia (NH3). When ammonia is present in a solution and Nessler's reagent is added, a reaction occurs. 4. **Color Change**: The reaction between Nessler's reagent and ammonia produces a yellowish-brown color or precipitate. This color change is a visual indication of the presence of ammonia in the sample. 5. **Conclusion**: Therefore, Nessler's reagent is K2HgI4, and it is used for the identification of ammonia due to the characteristic yellowish-brown color it produces upon reaction. **Final Answer**: Nessler's reagent is K2HgI4. ---
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