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We need to find which element is NOT present in Nessler's reagent.
Key Fact:
Nessler's reagent is K$$_2$$[HgI$$_4$$] — potassium tetraiodomercurate(II).
Elements present: K (potassium), Hg (mercury), I (iodine).
Elements NOT present: N (nitrogen).
The answer is Option 1: N. This matches the stored answer.
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