Question

Explain;

$Sc^{3+}$ is colourless in aqueous solution whereas $Ti^{3+}$ is coloured ?

Answer 1

Answer:

Explanation:

We know the electronic configuration of Sc and Ti

Sc:[Ar]4s2 3d1

Ti:[Ar]4s2 3d2

Now,for trivalent positive ions,three valence electrons are removed, first from s-orbital and then from d-orbital.

So,Sc3+ :[Ar]

Ti3+ :[Ar]3d1

We know that unpaired electrons are the cause for imparting colouration on account of d-d transition or charge transfer from metal atom to ligan.d.So,here Ti3+ is coloured in its aqueous solution whereas Sc3+ is not as all electrons are paired up.Hope you understood

Answer 2

Explanation:

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