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Friday, 9 October

JEE Main 2024 · ChemistryMultiple choiceSingle correctEasyRecall

JEE Main 6 April 2024, Shift 2, Chemistry Q72

Question 72 of 90 in this shift, Chemistry question 12 of 30, Section A.

During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in NH4OH\mathrm{NH_4OH} solution when sodium carbonate extract was first acidified with dil. HNO3\mathrm{HNO_3} and then AgNO3\mathrm{AgNO_3} solution was added. This indicates presence of :
  1. (1)Cl−\mathrm{Cl^-}
  2. (2)Br−\mathrm{Br^-}Official answer
  3. (3)I−\mathrm{I^-}
  4. (4)CO32−\mathrm{CO_3^{2-}}

Official answer

Option 2

NTA final key.

Chapter
Organic Chemistry: Some Basic Principles and Techniques
Topic
Anion Analysis
Idea tested
Halide Confirmatory Tests

Same topic in other shifts

All Anion Analysis questions
  1. 5 Apr 2026, Shift 2 · Q70A paper dipped in a dil. H2SO4\mathrm{H_2SO_4} solution of 'X' upon treatment with SO2\mathrm{SO_2} gas turns into green. The compound 'X' is :EasySingle correct
  2. 2 Apr 2025, Shift 2 · Q62Formation of Na4[Fe(CN)5NOS]\mathrm{Na_4[Fe(CN)_5NOS]}, a purple coloured complex formed by addition of sodium nitroprusside in sodium carbonate…EasySingle correct
  3. 8 Apr 2024, Shift 1 · Q73Match List I with List II LIST I (Compound): A. Fe4[Fe(CN)6]3⋅xH2O\mathrm{Fe_4[Fe(CN)_6]_3\cdot xH_2O}; B. [Fe(CN)5NOS]4−[\mathrm{Fe(CN)_5NOS}]^{4-}; C.…MediumMatch the list
  4. 29 Jan 2024, Shift 1 · Q79In chromyl chloride test for confirmation of Cl−\mathrm{Cl^-} ion, a yellow solution is obtained. Acidification of the solution and…MediumSingle correct
  5. 31 Jan 2024, Shift 1 · Q90Molar mass of the salt from NaBr\mathrm{NaBr}, NaNO3\mathrm{NaNO_3}, KI\mathrm{KI} and CaF2\mathrm{CaF_2} which does not evolve coloured vapours…EasyNumerical value
  6. 11 Apr 2023, Shift 1 · Q80When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown…EasySingle 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 42 of the 174 JEE Main shifts held from 2017 to 2026.