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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 7 April 2025, Shift 1, Chemistry Q63

Question 63 of 75 in this shift, Chemistry question 13 of 25, Section A.

When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is formed. X and Y respectively, are
  1. (1)X = HCl and Y = NH4Cl\mathrm{NH_4Cl}
  2. (2)X = NH4Cl\mathrm{NH_4Cl} and Y = KOH
  3. (3)X = NH3\mathrm{NH_3} and Y= HgO
  4. (4)X = NH3\mathrm{NH_3} and Y = K2HgI4\mathrm{K_2HgI_4} + KOHOfficial answer

Official answer

Option 4

NTA final key.

Chapter
Hydrogen
Topic
Cation Analysis
Idea tested
Group 0: Nessler's Reagent Complex Formula

Same idea in other shifts

Asked 2× in all
  1. 6 Apr 2023, Shift 2 · Q74Element not present in Nessler's reagent isEasySingle correct

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.