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Saturday, 31 October

JEE Main 2025 · ChemistryMultiple choiceSingle correctEasyApplication

JEE Main 7 April 2025, Shift 1, Chemistry Q62

Question 62 of 75 in this shift, Chemistry question 12 of 25, Section A.

An octahedral complex having molecular composition Co.5NH3.Cl.SO4\mathrm{Co.5NH_3.Cl.SO_4} has two isomers A and B. The solution of A gives a white precipitate with AgNO3\mathrm{AgNO_3} solution and the solution of B gives white precipitate with BaCl2\mathrm{BaCl_2} solution. The type of isomerism exhibited by the complex is,
  1. (1)Linkage isomerism
  2. (2)Co-ordinate isomerism
  3. (3)Ionisation isomerismOfficial answer
  4. (4)Geometrical isomerism

Official answer

Option 3

NTA final key.

Chapter
Coordination Compounds
Topic
Coordination Isomerism
Idea tested
Precipitation Tests for Ionization Isomers

Same idea in other shifts

Asked 8× in all
  1. 6 Apr 2026, Shift 2 · Q71An excess of AgNO3\mathrm{AgNO_3} is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles…EasyNumerical value
  2. 15 Apr 2023, Shift 1 · Q81The volume (in mL) of 0.1 M AgNO3\mathrm{AgNO_3} required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of…MediumNumerical value
  3. 29 Jun 2022, Shift 2 · Q87For the reaction given below : CoCl3⋅ x NH3+AgNO3\mathrm{CoCl_3\cdot}\,x\,\mathrm{NH_3 + AgNO_3} (aq) → If two equivalents of AgCl precipitate out, then…EasyNumerical value
  4. 30 Jun 2022, Shift 1 · Q71Correct formula of the compound which gives a white precipitate with BaCl2\mathrm{BaCl_2} solution, but not with AgNO3\mathrm{AgNO_3} solution, isEasySingle correct
  5. 3 Aug 2021, Shift 1 · Q59The number of ions produced in an aqueous solution from the octahedral complex with stoichiometry CoCl3.5H2O\mathrm{CoCl_3.5H_2O}, is ________.MediumNumerical value
  6. 8 Jan 2020, Shift 1 · Q49The volume (in mL) of 0.125 M AgNO3\mathrm{AgNO_3} required to quantitatively precipitate chloride ions in 0.3 g of…MediumNumerical value
  7. 2 Apr 2017 (offline) · Q50On treatment of 100 mL of 0.1 M solution of CoCl3.6H2O\mathrm{CoCl_3.6H_2O} with excess AgNO3\mathrm{AgNO_3}; 1.2×10221.2\times10^{22} ions are…MediumSingle 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.