Question

Fill in the blanks by choosing the appropriate word(s) from those given in the brackets:

(activation energy, Threshold energy, increased, lowered, partially, full, d-d transition, Benzoic acid, benzaldehyde)

Only those transition metal ions will be coloured which have ______ filled d-orbitals facilitating ______.

Answer 1

Only those transition metal ions will be coloured which have partially filled d-orbitals facilitating d-d transition.

Explanation:

Electrons can move from the lower energy d-orbitals to the higher energy d-orbitals by absorbing a photon of light; the wavelength of the absorbed light depends on the size of the energy gap. Any unabsorbed wavelengths of light pass through unabsorbed, and this causes the coloured appearance of the compounds.