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प्रश्न
The ions of d-block elements show colour because ______.
पर्याय
they absorb some energy for d-s transition.
they absorb some energy for p-d transition.
they absorb some energy for d-d transition.
they do not absorb any energy.
MCQ
रिकाम्या जागा भरा
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उत्तर
The ions of d-block elements show colour because they absorb some energy for d-d transition.
Explanation:
The ions of d-block elements are coloured because they contain unpaired electrons in their partially filled d-orbitals. When light falls on such ions, they absorb a part of the visible light to promote an electron from one d-orbital to another; this is called a d-d transition. The remaining light is transmitted or reflected, giving the ion its characteristic colour.
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