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Answer» (i) Sc3+ salts are colourless : - The electronic configuration of 21Sc [Ar| 3d14s2 and Sc3+ [Ar] d°.
- Since there are no unpaired electrons in 3d subshell, d → d transition is not possible.
- Therefore, Sc3+ ions do not absorb the radiations in the visible region. Hence salts of Sc3+ are colourless (or white).
(ii) Ti4+ salts are colourless : - The electronic configuration of 22Ti [Ar] 3d24s2 and Ti4+ : [Ar] d°
- Since there are no unpaired electrons in 3d subshell, d-*d transition is not possible.
- Therefore, Ti3+ ions do not absorb the radiation in visible region. Hence salts of Ti3+ are colourless.
(iii) Vs5+ salts are eolourless : - The electronic configuration of 23V : [Ar] 3d24s2 and V5+ : [Ar] 3d°
- Since there are no unpaired electrons in 3d-subshell, d – d transition is not possible.
- Therefore, V5+ ions do not absorb the radiations in the visible region. Hence, V5+ salts are colourless, a
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