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Coordination Compounds
Question
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In which of the following pairs are both the ions coloured in aqueous solution?

(At. no.: Sc = 21, Ti = 22, Ni = 28, Cu = 29, Co = 2)

  • Ni2+, Ti3+

  • Sc3+, Ti3+

  • Sc3+,Co2+

  • Ni2+, Cu+

Answer

A.

Ni2+, Ti3+

Ni28 = 1s2s, 2s2, 2p6, 3s2,3p6,3d8,4s2


Ni2+ = 1s2, 2s2, 2p6, 3s2,3p6,3d8
Ti22 = 1s2,2s2, 2p6, 3s2,3p6,3d2,4s2

Ti3+ = 1s2, 2s2, 2p6, 3s2,3p6,3d1
Sc21 = 1s2, 2s2, 2p6, 3s2,3p6,3d1,4s2
Sc3+ = 1s2, 2s2, 2p6, 3s2,3p6
(unpaired electron in d -orbital is not possible)
Cu29 = 1s2, 2s2, 2p6, 3s2,3p6,3d10,4s1
Cu+ =  1s2, 2s2, 2p6, 3s2,3p6,3d10

Hence, in above ions, Ni2+ and Ti3+ ions are coloured ions in aqueous solution due to presence of unpaired electrons in d -sub shell.

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