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Question

What is the color of ferrous sulfate crystals?


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Solution

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 FeSO4.
  • The color of ferrous sulfate crystal is light green.

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