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What is the IUPAC name of \( K_{2}\left[P t C l_{6}\right] ? \)

  1. Potassium hexachloro platinum
  2. Potassium hexachloro platinum (IV)
  3. Potassium hexa chloro platinate (IV)
  4. Dipotassium hexa chloro platinum

Correct answer: Potassium hexa chloro platinate (IV)

Solution

In K2[PtCl6], the complex ion is [PtCl6]2-, so platinum is in the +4 oxidation state because six chloride ligands contribute -6 total and the ion has a -2 charge. An anionic metal complex uses the metal name ending in “-ate,” giving “platinate(IV).”

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