Question

What is the color of ferrous sulfate crystals?

Answer 1

Reason for color in d-block elements

• An electron gets excited to a higher energy d orbital from a lower energy d orbital. The frequency of light absorbed is proportional to the excitation energy.
• This frequency is usually in the visible range.
• The color seen corresponds to the complementary color of the light absorbed.

Color of ferrous sulfate crystal

• The chemical formula of Ferrous sulfate is ${\mathrm{FeSO}}_4$.
• The color of ferrous sulfate crystal is light green.