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P Block — Easy JEE chemistry MCQ

**[JEE Mains 2026]** An element of p-block forms a species of type EH₄⁺, which when passed through a basic solution of K₂[HgI₄], forms a brown precipitate. Which element is E and what is the name of the test?
  1. A. N, Nessler's test
  2. B. P, phosphorus test
  3. C. S, Lassaigne's test
  4. D. C, carbon test

Solution

NH₄⁺ (ammonium ion) reacts with Nessler's reagent K₂[HgI₄] in basic medium to give a brown precipitate of iodide of Millon's base: [Hg₂N]I·H₂O. This is a confirmatory test for ammonia/ammonium ions.

CHEMISTRY

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[JEE Mains 2026] An element of p-block forms a species of type EH₄⁺, which when passed through a basic solution of K₂[HgI₄], forms a brown precipitate. Which element is E and what is the name of the test?
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P Block — Easy JEE Chemistry MCQ | MyGoalPrep