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JEE Main levelSingle correct optionDifficulty 2 of 3df069

Which one of the following hydrated ions is colourless in aqueous solution?

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

Answer: D

Colour in these ions arises from

d

-

d

transitions, which need partly filled

d

orbitals.

Sc X^{3 +}

is

3 d^{0}

and so colourless, whereas

Ti X^{3 +}

(

d^{1}

),

V X^{3 +}

(

d^{2}

) and

Mn X^{2 +}

(

d^{5}

, pale pink) are coloured.

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