Question

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Only for 12th

Why d-block elements forming colour compounds ? Explain .

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Answer 1

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The reason why transition metal in particular are colorful is because they have unfilled or either half filled d orbitals. There is Crystal field theory which explains the splitting of the d orbital, which splits the d orbital to a higher and lower orbital. Now, the electrons of the transition metal can "jump".

Answer 2

The d-block elements have unfilled outer orbitals and that's why they form coloured compounds.

• The d-block elements are the transition metals that are situated in groups 3 to 12.
• They form coloured compounds because they have unfilled outer orbitals.
• They also have energy involved in the d-d transition which is in a very small amount and those radiations are present in the visible light region.
• The radiations are absorbed by the unfilled orbitals' electrons which imparts them their colour.
• Examples are copper sulphate, ferric sulphate, etc.