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NEET2026ChemistryCoordination CompoundsActual

The formula of tetraammineaquachloridocobalt(III) chloride is

Options

  1. A[ Co(NH ₃)₄( H ₂ O ) Cl ] Cl ₂
  2. B[ Co(NH ₃)₄ Cl ₂] H ₂ O
  3. C[ Co(NH ₃)₄] Cl ₃ H ₂ O
  4. D[ Co(NH ₃)₄( H ₂ O ) Cl ] Cl

Correct answer

A. [ Co(NH ₃)₄( H ₂ O ) Cl ] Cl ₂

Step-by-step solution

The complex name is tetraammineaquachloridocobalt(III) chloride. The central metal ion is cobalt(III), which means Co is in the +3 oxidation state. The ligands inside the coordination sphere are four ammine ( NH ₃ ) molecules which are neutral, one aqua ( H ₂ O ) molecule which is neutral, and one chlorido ( Cl ^- ) ion which has a -1 charge. The coordination sphere is [ Co ( NH ₃)₄( H ₂ O ) Cl ] . The charge on the complex ion is calculated as +3 + 4(0) + 0 + (-1) = +2 . To balance the +2 charge of the complex ion

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