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Question

MCl4heatZn Purple colour compound (Colourless (A)
liquid)
M= Transition metal
Moist air
(B)
White fumes
Identify (A), (B) and MCl4. Also explain colour difference between MCl4 and (A).

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Solution

TiCl4heatZnTiCl3H2O[Ti(H2O)6]Cl3 Purple color (A)
TiCl4+(n+2)H2O (moist air)TiO2(H2O)n+4HCl white fumes (B)
Ti4+=[Ar]3d°
Ti3+=[Ar]3d1
Ti (+IV) ion contains no d-electron, while d-d-transition of single electron in Ti (+III) causes color change.

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