Ti3+=1s2,2s22p6,3s23p63d1 Sc3+=1s2,2s22p6,3s23p6 (Unpaired electron absent in d-orbital) Cu+=1s2,2s22p6,3s23p63d10 Thus, Cu+has completely occupied d-orbital. Hence, in the above ions, Ni2+ and Ti3+ ions are coloured ions in the aqueous solution because of the presence of unpaired electrons in the d-subshell. Related Theory Whenever light falls on the transition element compounds electrons absorb energy and excite. When these electrons de-excite they release visible light wavelength. That's why transition element compounds exhibit colour.
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=27]
NEET UG 2006 — Chemistry Inorganic Chemistry
2006mcqmedium
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=27]
Official previous-year question
Held on 30 Apr 2006 · Verified 9 Jul 2026.
Options
- A
Ni2+,Ti3+
- B
Sc3+,Ti3+
- C
Sc3+,Co2+
- D
Ni2+,Cu+
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