Consider a mixture ' X ' which is made by dissolving 0.4 mol of [ Co ( NH 3 ) 5 SO 4 ] Br and 0.4 mol of [ Co ( NH 3 ) 5 Br ] SO 4 in water to make 4 L of solution. When 2 L of mixture ' X ' is allowed to react with excess of AgNO 3 , it forms precipitate ' Y '. The rest 2 L of mixture ' X ' reacts with excess BaCl 2 to form precipitate ' Z '. Which of the following statements is CORRECT.

Y ' is BaSO 4 and ' Z ' is AgBr

Chemistry · Coordination Compounds

JEE Main 2026 — 24 January, Morning Shift — Question 53

Consider a mixture ' X ' which is made by dissolving 0.4 mol of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}$ and 0.4 mol of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}$ in water to make 4 L of solution. When 2 L of mixture ' X ' is allowed to react with excess of $\mathrm{AgNO}_{3}$ , it forms precipitate ' Y '. The rest 2 L of mixture ' X ' reacts with excess $\mathrm{BaCl}_{2}$ to form precipitate ' $Z$ '. Which of the following statements is CORRECT.

Option A:
0.2 mol of ' $Z$ ' is formed
Correct
Option B:
Y ' is $\mathrm{BaSO}_{4}$ and ' Z ' is AgBr
Option C:
0.4 mol of ' $Z$ ' is formed
Option D:
0.1 mol of ' $Y$ ' is formed

Answer: A

Step-by-step solution

$0.4 \mathrm{~mol}\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}+0.4 \mathrm{~mol}\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}$ are present in 4 lit. solution. 2 lit. of mixture will contain 0.2 mol of each complex. 2 lit. mixture on reaction with excess $\mathrm{AgNO}_{3}, 0.2$ mole AgBr will be formed $(\mathrm{Y})$ .

2 lit. mixture on reaction with excess $\mathrm{BaCl}_{2}, 0.2$ mole $\mathrm{BaSO}_{4}$ will be formed (Z).

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Exam: JEE Main 2026
Paper: 24 January, Morning Shift
Subject: Chemistry
Chapter: Coordination Compounds
Topic: preparation and Uses of Coordination Compounds

Answer: A

Step-by-step solution

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