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JEE Main levelOne or more correct optionsDifficulty 2 of 3cc126

Which of the following statements about Werner's theory are correct? One or more options may be correct.

  1. APrimary valence corresponds to the oxidation state of the metal and is satisfied by negative ions.
  2. BSecondary valence is non-ionisable and is directed in space.
  3. CThe number of secondary valences of a metal is always equal to its number of primary valences.
  4. DSecondary valences may be satisfied by neutral molecules as well as by negative ions.

Answer: A, B, D

Primary valence equals oxidation state, is ionisable and is satisfied by anions (option 1 true). Secondary valence is non-ionisable and directional, giving definite geometry (option 2 true), and ligands may be neutral or anionic (option 4 true). Coordination number and oxidation state are generally different, e.g. Co(III) with coordination number 6 (option 3 false).
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