Ncert Exercises & Solutions

Which of the following species is not expected to be a ligand?

1. NO

2. NH $_{4}^{+}$

3. NH $_{2}$ CH $_{2}$ CH $_{2}$ NH $_{2}$

4. CO

A chelating ligand has two or more binding donor atoms to a single metal ion

eg.

Here (4) denotes binding site.

thiosulphato ( $S_{2} O_{3}^{2}$ ) is not a chelating ligand because geometrically it is

not favourable for ( $S_{2} O_{3}^{2}$ ) to chelate a metal ion.