Question

The ability of $d$-block elements to form complexes is due to:

• A. small and highly charged ions
• B. vacant low energy orbitals to accept lone pair of electrons from ligands
• C. low polarizing power of cation
• D. none is correct

Answer 1

Answer: (A), (B)

small and highly charged ions
vacant low energy orbitals to accept lone pair of electrons from ligands

The reason transition elements form complexes is that they have a small, highly charged ions and have vacant low energy orbitals to accept lone pairs of electrons donated by other groups or ligands.