JEE Main 2021 · ChemistryNumerical answerNumerical valueMediumApplication

JEE Main 3 August 2021, Shift 1, Chemistry Q59

Question 59 of 90 in this shift, Chemistry question 29 of 30, Section B.

The number of ions produced in an aqueous solution from the octahedral complex with stoichiometry

\mathrm{CoCl_3.5H_2O}

, is ________.

Official answer

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

6 Apr 2026, Shift 2 · Q71An excess of $\mathrm{AgNO_3}$ is added to 100 mL of a 0.05 M solution of tetraaquadichloridochromium (III) chloride. The number of moles…EasyNumerical value
7 Apr 2025, Shift 1 · Q62An octahedral complex having molecular composition $\mathrm{Co.5NH_3.Cl.SO_4}$ has two isomers A and B. The solution of A gives a white…EasySingle correct
15 Apr 2023, Shift 1 · Q81The volume (in mL) of 0.1 M $\mathrm{AgNO_3}$ required for complete precipitation of chloride ions present in 20 mL of 0.01 M solution of…MediumNumerical value
29 Jun 2022, Shift 2 · Q87For the reaction given below : $\mathrm{CoCl_3\cdot}\,x\,\mathrm{NH_3 + AgNO_3}$ (aq) → If two equivalents of AgCl precipitate out, then…EasyNumerical value
30 Jun 2022, Shift 1 · Q71Correct formula of the compound which gives a white precipitate with $\mathrm{BaCl_2}$ solution, but not with $\mathrm{AgNO_3}$ solution, isEasySingle correct
8 Jan 2020, Shift 1 · Q49The volume (in mL) of 0.125 M $\mathrm{AgNO_3}$ required to quantitatively precipitate chloride ions in 0.3 g of…MediumNumerical value
2 Apr 2017 (offline) · Q50On treatment of 100 mL of 0.1 M solution of $\mathrm{CoCl_3.6H_2O}$ with excess $\mathrm{AgNO_3}$ ; $1.2\times10^{22}$ 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.