`Sc^(3+)` is colourless is aqueous solution whereas `Ti^(3+)` is coloured.

Give reason : Sc^(3+) is colourless in aqueous solution whereas Ti^(3+) is coloured.

Give reason for the folloiwng : (a) E_("value")^(@) for Mn^(3+)//Mn^(2+) couple is much more positive than that of Fe^(3+)//Fe^(2+) couple. (b) Iron has higher enthalpy of atomization then that of copper. (c) Sc^(3+) is colourless in aqueous solution whereas Ti^(3+) is coloured.

Give reason for the folloiwng : (a) E_("value")^(@) for Mn^(3+)//Mn^(2+) couple is much more positive than that of Fe^(3+)//Fe^(2+) couple. (b) Sc^(3+) is colourless in aqueous solution whereas Ti^(3+) is coloured.

Answer the following: Aqueous solution of Ti^(4+) is colourless, but aqueous solution of Ti^(3+) is violet in colour. Explain.

Aqueous solution of Ti^(4+) is colourless, but aqueous solution of Ti^(3+) is violet in colour. Ex-plain.

Explain the following : Out of Sc^(3+), Co^(2+) and Cr^(3+) ions, only Sc^(3+) is colourless in aqueous solutions. (Atomic no. : Co = 27 Sc = 21 and Cr = 24)

Sc^(3+) ions are colourless where as V^(3+) ions are coloured. Give reason.

Sc^+3 ions are colourless. Why ?