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Saturday, 31 October

JEE Main 2024 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 6 April 2024, Shift 1, Chemistry Q72

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

Match List I with List II LIST I (Precipitating reagent and conditions) A. NH4Cl+NH4OH\mathrm{NH_4Cl + NH_4OH} B. NH4OH+Na2CO3\mathrm{NH_4OH + Na_2CO_3} C. NH4OH+NH4Cl+H2S\mathrm{NH_4OH + NH_4Cl + H_2S} gas D. dilute HCl LIST II (Cation) I. Mn2+\mathrm{Mn^{2+}} II. Pb2+\mathrm{Pb^{2+}} III. Al3+\mathrm{Al^{3+}} IV. Sr2+\mathrm{Sr^{2+}} Choose the correct answer from the options given below:
  1. (1)A-III, B-IV, C-II, D-I
  2. (2)A-III, B-IV, C-I, D-IIOfficial answer
  3. (3)A-IV, B-III, C-II, D-I
  4. (4)A-IV, B-III, C-I, D-II

Official answer

Option 2

NTA final key.

Chapter
Practical Chemistry (Qualitative Analysis)
Topic
Cation Analysis
Idea tested
Group Reagent Identification

Same topic in other shifts

All Cation Analysis questions
  1. 2 Apr 2026, Shift 1 · Q70A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid…MediumSingle correct
  2. 4 Apr 2026, Shift 2 · Q69Among Fe3+\mathrm{Fe^{3+}}, Pb2+\mathrm{Pb^{2+}}, Cu2+\mathrm{Cu^{2+}} and Mn2+\mathrm{Mn^{2+}}, identify the one that gets precipitated out while…MediumSingle correct
  3. 2 Apr 2025, Shift 1 · Q62Choose the correct tests with respective observations. (A) CuSO4\mathrm{CuSO_4} (acidified with acetic acid) +…MediumOther
  4. 7 Apr 2025, Shift 1 · Q63When a salt is treated with sodium hydroxide solution it gives gas X. On passing gas X through reagent Y a brown coloured precipitate is…EasySingle correct
  5. 4 Apr 2024, Shift 1 · Q72In the precipitation of the iron group (III) in qualitative analysis, ammonium chloride is added before adding ammonium hydroxide to :MediumSingle correct
  6. 6 Apr 2024, Shift 2 · Q87Consider the following reactions NiS+HNO3+HCl→A+NO+S+H2O\mathrm{NiS + HNO_3 + HCl \rightarrow A + NO + S + H_2O}…HardNumerical 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 108 of the 174 JEE Main shifts held from 2017 to 2026.