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प्रश्न
Give reasons: Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured.
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उत्तर १
Sc3+ has no unpaired electron. So, it is colourless, whereas Ti3+ has one unpaired electron. Hence, it is coloured
उत्तर २
Compounds of transition elements are coloured due to the presence of unpaired electrons in d-orbitals as they show d-d-transition. In Sc+3 there are no d-electrons in Ti+3 there is one d-electrons.
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संबंधित प्रश्न
The elements of 3d transition series are given as: Sc Ti V Cr Mn Fe Co
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| Element | M3+/M | M+/M |
| Al | - 1.66 | +0.55 |
| Tl | + 1.26 | -0.34 |
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