MHT CET · Chemistry · d and f Block Elements
Which of the ions is colourless inspite of the presence of unpaired electrons?
- A \(\mathrm{La}^{3+}\)
- B \(\mathrm{Eu}^{3+}\)
- C \(\mathrm{Gd}^{3+}\)
- D \(\mathrm{Lu}^{3+}\)
Answer & Solution
Correct Answer
(C) \(\mathrm{Gd}^{3+}\)
Step-by-step Solution
Detailed explanation
Gadolinium does not absorb light in the visible region of the spectrum, hence it is colourless inspite of the presence of 7 unpaired electrons. Being colourless, gadolinium is sometimes used as a support for other rare earth phosphors and luminesce in the knowledge that it will not quench their intense colour.
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