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JEE Main Chemistry Coordination Compounds 2026 JEE Main 2026 (24 January Shift 1)

JEE Main Chemistry Question (2026) — Solution

Question

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?

Options

  1. A. 0.1 mol of ' Y ' is formed.
  2. B. 0.2 mol of ' Z ' is formed.
  3. C. 0.4 mol of ' Z ' is formed.
  4. D. ^ Y ^ is BaSO _ 4 and ' Z ' is AgBr.

Answer

B. 0.2 mol of ' Z ' is formed.

Step-by-step solution

0.4 mol [Co(NH_3)_5SO_4]Br + 0.4 mol [Co(NH_3)_5Br]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 AgNO_3, 0.2 mole AgBr will be formed (Y). 2 lit. mixture on reaction with excess BaCl_2, 0.2 mole BaSO_4 will be formed (Z).

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