A) Metalloids
B) Non-metals
C) p-block elements
D) Transition elements
Correct Answer: D
Solution :
Cation having incompletely filled d-orbitals form coloured compounds p-block elements due to absence of incompletely filled d-orbitals are colorless. All the non-metals and metalloids are present in p-block. In transition elements incomplete d-orbitals are present, hence they are capable of forming coloured ions.
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