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The lanthanoide that would show colour is

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${Gd}^{3 +}$

${La}^{3 +}$

${Lu}^{3 +}$

${Sm}^{3 +}$

answer is D.

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Detailed Solution

${Sm}^{3 +}$ shows blood red colour due to charge transform and colour of the ions depend on the number of unpaired electrons because the elements with (x)f electrons often have a similar colour to those of $(14 - x) f$ electrons.

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