Out of the following ions Ti 3 + , V 3 + , Cu + , Sc 3 + , Mn 2 + , Fe 3 + and Co 2 + the colourless ions will be

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Only those ions will be coloured which have incomplete d - orbitals. Ions which has complete or vacant d - orbitals are colourless.

Ti³⁺ = [Ar] 3d¹	Purple
V³⁺ = [Ar] 3d²	Green
Cu⁺ = [Ar] 3d¹⁰	Colourless
Sc³⁺ = [Ar]	Colourless
Mn²⁺ = [Ar] 3d⁵	Pink
Fe³⁺ = [Ar] 3d⁵	Brown
Co²⁺ = [Ar] 3d⁷	Pink

As Sc³⁺and Cu⁺have 3d⁰and 3d¹⁰configuration in their valence shell so their aqueous solutions are colourless. All others, i.e., Ti³⁺, V³⁺, Mn²⁺, Fe³⁺and Co²⁺are coloured in aqueous medium.

Chemistry - Complete d-block Question with Solution | TestHub

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