JEE Main 2020 · ChemistryNumerical answerNumerical valueMediumMulti-step

JEE Main 8 January 2020, Shift 1, Chemistry Q49

Question 49 of 75 in this shift, Chemistry question 24 of 25, Section B.

The volume (in mL) of 0.125 M

\mathrm{AgNO_3}

required to quantitatively precipitate chloride ions in 0.3 g of

[\mathrm{Co(NH_3)_6}]\mathrm{Cl_3}

is ______.

^{M}[\mathrm{Co(NH_3)_6}]\mathrm{Cl_3} = 267.46\ \mathrm{g/mol}

^{M}\mathrm{AgNO_3} = 169.87\ \mathrm{g/mol}

Official answer

26.60 to 27.00

NTA final key (Jan 2020). Any value in the range scored.

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

Same idea in other shifts

Asked 4× 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
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 42 of the 174 JEE Main shifts held from 2017 to 2026.