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JEE Main levelOne or more correct optionsDifficulty 2 of 3df022

Select ALL species that are colourless in the solid or in aqueous solution because they have no d-d transitions.

A $Cr X^{3 +}$
B $Sc X^{3 +}$
C $Ti X^{4 +}$
D $Zn X^{2 +}$

Answer: B, C, D

d-d transitions need a partly filled d subshell.

Zn X^{2 +}

(

d^{10}

),

Sc X^{3 +}

(

d^{0}

) and

Ti X^{4 +}

(

d^{0}

) are colourless.

Cr X^{3 +}

(

d^{3}

) is coloured (violet or green).

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