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  • Which of the following ions will exhibit colour in aqueous solutions?Option: 1 <img alt="La^{3+} (Z=57)" src="https://learn.careers360.com/latex-imag

Which of the following ions will exhibit colour in aqueous solutions?

Option: 1

La^{3+} (Z=57)


Option: 2

Ti^{3+} (Z=22)


Option: 3

Lu^{3+} (Z=71)


Option: 4

Sc^{3+} (Z=21)


Answers (1)

best_answer

For colour, a metal must have unpaired electrons

Electronic config. of given species:

La^{3+}(Z=57)=[Xe]4f^{0}5d^{0}6s^{0}

Ti^{3+}(Z=22)=[Ar]3d^{1}4s^{0}, in unpaired e^{-}

Lu^{3+}(Z=71)=[Xe] 4f^{14}5d^{0}6s^{0}

Sc^{3+}(Z=21)=[Ar] 3d^{0}4s^{0}

Since, Ti^{3+}is the only species with an unpaired e^{-}, it will display colour in aqueous sol. 

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Gunjita

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