JEE Main 2026 — Coordination Compounds Question with Solution
JEE Main 2026 (24 January Shift 2)
Question
A chromium complex with a formula has a spin only magnetic moment value of 3.87 BM and its solution conductivity corresponds to electrolyte. 2.75 g of the complex solution was initially passed through a cation exchanger. The solution obtained after the process was reacted with excess of . The amount of AgCl formed in the above process is g. (Nearest integer)
[Given: Molar mass in ]
[Given: Molar mass in ]
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Show full solutionCorrect answer: 3
Correct answer
3
Step-by-step explanation
The complex with magnetic moment 3.87 BM indicates giving n = 3 unpaired electrons, confirming Cr³⁺.
A 1:2 electrolyte means structure is .
Molar mass = 52 + 5(18) + 35.5 + 6(18) = 285.5 g/mol.
Moles of complex = 2.75/285.5 = 0.00963 mol.
After cation exchange, 2 Cl⁻ remain per formula unit (from the 1:2 electrolyte), giving 0.00963 × 2 = 0.01926 mol of free Cl⁻.
Reacting with excess AgNO₃: mass of AgCl = 0.01926 × 143.5 = 2.76 g ≈ 3 g (nearest integer).
A 1:2 electrolyte means structure is .
Molar mass = 52 + 5(18) + 35.5 + 6(18) = 285.5 g/mol.
Moles of complex = 2.75/285.5 = 0.00963 mol.
After cation exchange, 2 Cl⁻ remain per formula unit (from the 1:2 electrolyte), giving 0.00963 × 2 = 0.01926 mol of free Cl⁻.
Reacting with excess AgNO₃: mass of AgCl = 0.01926 × 143.5 = 2.76 g ≈ 3 g (nearest integer).
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This is a previous-year question from JEE Main 2026, covering the Coordination Compounds chapter of Chemistry. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.