8.28 Predict which of the following will be coloured in aqueous solution? Ti3+, V3+ , Cu+ , Sc 3+, Mn2+, Fe 3+ and Co 2+. Give reasons for each.

8.28 Metal ions which have valence electrons in d-orbital and in which d-d transition can take place will be coloured and the metal ions which have completely filled orbital or have d- orbital will be colourless as no d-d transition is possible in those configurations.ElementAtomic NumberIonic StateElectronic configuration in ionic stateTi22Ti3+ [Ar] 3d1V23V3+ [Ar] 3d2Cu29Cu+ [Ar] 3d10Sc21Sc3+ [Ar]Mn25Mn2+ [Ar] 3d5Fe26Fe3+ [Ar] 3d5Co27Co2+ [Ar] 3d7From the above table, it can be observed that only Sc3+ and Cu+ have either completely filled d- orbital or empty d-orbital. So, all other ions except Sc3+ and Cu+ will be coloured in aqueous solution because of absorption of radiations which fall in the visible region as on obtaining energy electrons jump from one d-orbital to another.

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Ncert Solutions Chemistry Class 12th Chemistry Class 12th Block D and F Elements

8.28 Predict which of the following will be coloured in aqueous solution? Ti³⁺, V³⁺ , Cu⁺ , Sc³⁺, Mn²⁺, Fe³⁺ and Co ²⁺. Give reasons for each.

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Payal Gupta | Contributor-Level 10

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8.28 Metal ions which have valence electrons in d-orbital and in which d-d transition can take place will be coloured and the metal ions which have completely filled orbital or have d- orbital will be colourless as no d-d transition is possible in those configurations.

Element	Atomic Number	Ionic State	Electronic configuration in ionic state
Ti	22	Ti³⁺	[Ar] 3d¹
V	23	V³⁺	[Ar] 3d²
Cu	29	Cu⁺	[Ar] 3d¹⁰
Sc	21	Sc³⁺	[Ar]
Mn	25	Mn²⁺	[Ar] 3d⁵
Fe	26	Fe³⁺	[Ar] 3d⁵
Co	27	Co²⁺	[Ar] 3d⁷

From the above table, it can be observed that only Sc³⁺ and Cu⁺ have either completely filled d- orbital or empty d-orbital. So, all other ions except Sc³⁺ and Cu⁺ will be coloured in aqueous solution because of absorption of radiations which fall in the visible region as on obtaining energy electrons jump from one d-orbital to another.

8.28 Metal ions which have valence electrons in d-orbital and in which d-d transition can take place will be coloured and the metal ions which have completely filled orbital or have d- orbital will be colourless as no d-d transition is possible in those configurations.<table style="height: 514px; width: 77.8106%;"><tbody><tr><td style="width: 10.6598%;">Element</td><td style="width: 20.6235%;">Atomic Number</td><td style="width: 13.6474%;">Ionic State</td><td style="width: 47.1806%;">Electronic configuration in ionic state</td></tr><tr><td style="width: 10.6598%;">Ti</td><td style="width: 20.6235%;">22</td><td style="width: 13.6474%;">Ti3+</td><td style="width: 47.1806%;"> [Ar] 3d1</td></tr><tr><td style="width: 10.6598%;">V</td><td style="width: 20.6235%;">23</td><td style="width: 13.6474%;">V3+</td><td style="width: 47.1806%;"> [Ar] 3d2</td></tr><tr><td style="width: 10.6598%;">Cu</td><td style="width: 20.6235%;">29</td><td style="width: 13.6474%;">Cu+</td><td style="width: 47.1806%;"> [Ar] 3d10</td></tr><tr><td style="width: 10.6598%;">Sc</td><td style="width: 20.6235%;">21</td><td style="width: 13.6474%;">Sc3+</td><td style="width: 47.1806%;"> [Ar]</td></tr><tr><td style="width: 10.6598%;">Mn</td><td style="width: 20.6235%;">25</td><td style="width: 13.6474%;">Mn2+</td><td style="width: 47.1806%;"> [Ar] 3d5</td></tr><tr><td style="width: 10.6598%;">Fe</td><td style="width: 20.6235%;">26</td><td style="width: 13.6474%;">Fe3+</td><td style="width: 47.1806%;"> [Ar] 3d5</td></tr><tr><td style="width: 10.6598%;">Co</td><td style="width: 20.6235%;">27</td><td style="width: 13.6474%;">Co2+</td><td style="width: 47.1806%;"> [Ar] 3d7</td></tr></tbody></table>From the above table, it can be observed that only Sc3+ and Cu+ have either completely filled d- orbital or empty d-orbital. So, all other ions except Sc3+ and Cu+ will be coloured in aqueous solution because of absorption of radiations which fall in the visible region as on obtaining energy electrons jump from one d-orbital to another.

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8.28 Predict which of the following will be coloured in aqueous solution? Ti³⁺, V³⁺ , Cu⁺ , Sc³⁺, Mn²⁺, Fe³⁺ and Co ²⁺. Give reasons for each.

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