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Transition elements form complexes due to 

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By Expert Faculty of Sri Chaitanya
a
Small size
b
High positive charge density
c
Presence of vacant d orbitals
d
All the above

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detailed solution

Correct option is D

Due to small size, vacant orbitals and high positive charge density transition metal ions can accept the lone pairs donated by ligands easily. They form complexes readily.With a small size and high positive charge (+2, +3, +4, +5, +6, +7) their charge density is high and have a great tendency to act like electron pair acceptors.


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