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Friday, 9 October

JEE Main 2021 · ChemistryMultiple choiceMatch the listMediumRecall

JEE Main 3 August 2021, Shift 2, Chemistry Q48

Question 48 of 90 in this shift, Chemistry question 18 of 30, Section A.

Match List I with II List I | List II (Ion detected) A. Borax Bead test | I. As3+\mathrm{As^{3+}} B. Charcoal cavity test | II. Al3+\mathrm{Al^{3+}} C. Flame test | III. Fe3+\mathrm{Fe^{3+}} D. Lake test | IV. Sr2+\mathrm{Sr^{2+}} Choose the correct answer from the options given below :
  1. (1)A – III, B – I, C – IV, D – IIOfficial answer
  2. (2)A – IV, B – I, C – II, D – III
  3. (3)A – III, B – II, C – IV, D – I
  4. (4)A – I, B – III, C – IV, D – II

Official answer

Option 1

NTA final key.

Chapter
Practical Chemistry (Qualitative Analysis)
Topic
Cation Analysis
Idea tested
Confirmatory Tests

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. 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
  6. 8 Apr 2024, Shift 1 · Q72Match List I with List II LIST I (Name of the test): A. Borax bead test; B. Charcoal cavity test; C. Cobalt nitrate test; D. Flame test…MediumMatch the list

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.