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NEET levelSingle correct optionDifficulty 1 of 3df004

Which of the following aqueous ions is colourless?

A $Cu X^{2 +}$
B $V X^{3 +}$
C $Sc X^{3 +}$
D $Ti X^{3 +}$

Answer: C

Colour of aqueous ions arises from d-d transitions, which need partly filled d orbitals.

Sc X^{3 +}

is

3 d^{0}

and is colourless, whereas

Ti X^{3 +}

(

d^{1}

),

V X^{3 +}

(

d^{2}

) and

Cu X^{2 +}

(

d^{9}

) are coloured.

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