What is the formula of iodide of Millon's base?

Explanation

To determine the formula of the iodide of Millon's base, we can follow these steps:

### Step 1: Understand Millon's Base
Millon's base is a compound formed from the reaction of mercury(II) salts with ammonia. The relevant compound here is the mercury(I) compound that forms when Millon’s reagent (Nessler's reagent) reacts with ammonia.

### Step 2: Identify Nessler's Reagent
Nessler's reagent is represented by the formula K2HgI4, which contains potassium (K), mercury (Hg), and iodine (I). It is used to detect ammonia in solutions.

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