NEET UG 2006 — Chemistry Inorganic Chemistry

2006mcqmedium

In which of the following pairs are both the ions coloured in aqueous solution- [At. No. : $\mathrm{Sc}=21, \mathrm{Ti}=22, \mathrm{Ni}=28, \mathrm{Cu}=29, \mathrm{Co}=27$ ]

Official previous-year question

Held on 30 Apr 2006 · Verified 9 Jul 2026.

Options

A
$\mathrm{Ni}^{2+}, \mathrm{Ti}^{3+}$
B
$\mathrm{Sc}^{3+}, \mathrm{Ti}^{3+}$
C
$\mathrm{Sc}^{3+}, \mathrm{Co}^{2+}$
D
$\mathrm{Ni}^{2+}, \mathrm{Cu}^{+}$

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Solution

$\mathrm{Ti}^{3+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^1$ $\mathrm{Sc}^{3+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6$ (Unpaired electron absent in d-orbital) $\mathrm{Cu}^{+}=1 s^2, 2 s^2 2 p^6, 3 s^2 3 p^6 3 d^{10}$ Thus, $\mathrm{Cu}^{+}$ has completely occupied $d$ -orbital. Hence, in the above ions, $\mathrm{Ni}^{2+}$ and $\mathrm{Ti}^{3+}$ 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.

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Solution

NEET UG 2006 — Chemistry Inorganic Chemistry

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NEET UG 2006 — Chemistry Inorganic Chemistry

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Solution

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NEET UG Inorganic Chemistry in other years

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Other Chemistry topics for NEET UG

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