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JEE Main levelSingle correct optionDifficulty 2 of 3df130

Among the following hydrated trivalent lanthanide ions, the one that is colourless is:

A $Pr X^{3 +}$
B $La X^{3 +}$
C $Nd X^{3 +}$
D $Er X^{3 +}$

Answer: B

La X^{3 +}

is

4 f^{0}

, with no f electron to be excited, and is colourless.

Pr X^{3 +}

(

4 f^{2}

),

Nd X^{3 +}

(

4 f^{3}

) and

Er X^{3 +}

(

4 f^{11}

) show f-f transitions and are coloured.

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