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NEET levelSingle correct optionDifficulty 1 of 3cc111

According to Werner's theory, the primary valence of a metal in a coordination compound corresponds to its

  1. Acoordination number, satisfied by negative ions and ionisable
  2. Bcoordination number, satisfied by ligands and non-ionisable
  3. Coxidation state, satisfied by negative ions and ionisable
  4. Doxidation state, satisfied by neutral ligands and non-ionisable

Answer: C

Werner's primary valence is the ionisable valence and equals the oxidation state of the metal. It is satisfied by anions, whereas the secondary valence (coordination number) is non-ionisable and is satisfied by ligands. Hence the first option is correct.
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