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Friday, 9 October

JEE Main 2023 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 11 April 2023, Shift 1, Chemistry Q80

Question 80 of 90 in this shift, Chemistry question 20 of 30, Section A.

When a solution of mixture having two inorganic salts was treated with freshly prepared ferrous sulphate in acidic medium, a dark brown ring was formed whereas on treatment with neutral FeCl3\mathrm{FeCl_3}, it gave deep red colour which disppeared on boiling and a brown red ppt was formed. The mixture contains
  1. (1)C2O42−\mathrm{C_2O_4^{2-}} & NO3−\mathrm{NO_3^-}
  2. (2)CH3COO−\mathrm{CH_3COO^-} & NO3−\mathrm{NO_3^-}Official answer
  3. (3)SO32−\mathrm{SO_3^{2-}} & CH3COO−\mathrm{CH_3COO^-}
  4. (4)SO32−\mathrm{SO_3^{2-}} & C2O42−\mathrm{C_2O_4^{2-}}

Official answer

Option 2

NTA final key.

Chapter
Practical Chemistry (Qualitative Analysis)
Topic
Anion Analysis
Idea tested
Acetate Neutral FeCl3 Test

Same topic in other shifts

All Anion Analysis questions
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  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. 6 Apr 2024, Shift 2 · Q72During the detection of acidic radical present in a salt, a student gets a pale yellow precipitate soluble with difficulty in…EasySingle correct
  4. 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
  5. 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
  6. 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

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.