Question

please answer this ​

Answer 1

Answer: electronic configuration of Ti4+ is fully filled while Cr3+ has d4 configuration due to which there is non paired electron in Titanium 4 positive and there are four unpaired electron in Cr 3 positive

So that's why Titanium 4 positives is colourless and chromium 3 positive is coloured

Answer 2

Answer:

Because of the phenomenon of d-d transition

Explanation:

The excitation of electron from lower energy d level to higher energy d level is called d-d transition.

In Ti4+

Ti4+= [Ar]

No vacant d orbital for excitation. So no colour.

In Cr3+

Cr3+=[Ar]3d3

This is a half-filled t2g state. So excitation takes place.

Therefore,when this excited electron returns to ground state, colour in form of light is shown.

This proves that Cr3+ salts are coloured.

The main point is d-d transition.

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