Three of these are wrong. Find the one that holds.

Exercise and reference answers

Questions

1. Question

   Three of these statements about coordination number are false.

   Choices

   1. Item

      It counts sigma bonds only

      Correct

      Yes

   2. Explanation

      A didentate ligand contributes two donor atoms.

      Item

      It counts the number of ligands

   3. Explanation

      syllabus excludes pi bonds explicitly.

      Item

      Pi bonds are included

   4. Explanation

      Those are different quantities entirely.

      Item

      It equals the oxidation number

2. Question

   Three of these statements about ligands are false.

   Choices

   1. Item

      EDTA⁴⁻ is hexadentate

      Correct

      Yes

   2. Explanation

      It binds through two nitrogens.

      Item

      en is a unidentate ligand

   3. Explanation

      It has one donor atom, so unidentate.

      Item

      NH₃ is didentate

   4. Explanation

      They use either one, not both.

      Item

      Ambidentate ligands use both donors

Explanation