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JEE Advanced levelSingle correct optionDifficulty 3 of 3cc069

Compound gives a white precipitate with and none with . Its ionisation isomer Y gives no precipitate with but a pale yellow precipitate with . Y is named

  1. Apentaamminebromidocobalt(III) sulfate
  2. Bpentaamminebromidosulfatocobalt(III)
  3. Cpentaamminesulfatocobalt(III) bromide
  4. Dpentaamminesulfatocobalt(II) bromide

Answer: C

Y must release free bromide (pale yellow AgBr) and keep sulfate inside the sphere: . Sulfate is a ligand, so the cation is and Co is +3. The name is pentaamminesulfatocobalt(III) bromide.
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