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Q.

Which of the following pairs of ions have the same colour?

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a

$_{58} {Ce}^{3 +},_{63} {Eu}^{3 +}$

b

$_{59} \Pr^{3 +},_{64} {Gd}^{3 +}$

c

$_{62} {Sm}^{3 +}_{66} {Dy}^{3 +}$

d

$_{71} {Lu}^{3 +},_{69} {Tm}^{3 +}$

answer is C.

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Detailed Solution

Only ${Sm}^{3 +}$ and ${Dy}^{3 +}$ have electrons 5 and 9 (=14 -5) electrons.

The ions having $(4 f)^{n -}$ and $(4 f)^{14 - n}$ electrons have identical colour.

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Which of the following pairs of ions have the same colour?