JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

In following pairs, the one in which both transition metal ions are colourless is

Official previous-year question

Held on 29 Jul 2022 · Verified 6 Jul 2026.

Options

A
${\mathrm{Sc}}^{3+},{\mathrm{Zn}}^{2+}$
B
${\mathrm{Ti}}^{4+},{\mathrm{Cu}}^{2+}$
C
${V}^{2+},{\mathrm{Ti}}^{3+}$
D
${\mathrm{Zn}}^{2+},{\mathrm{Mn}}^{2+}$

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Solution

$d$ -block elements form coloured ions due to presence of unpaired electrons in them. since there are no unpaired electrons in ${\mathrm{Sc}}^{3+}$ and ${\mathrm{Zn}}^{2+}$ ions, they are colourless.

No of unpaired ${e}^{-}$

${\mathrm{Ti}}^{3+}-[\mathrm{Ar}]3{d}^{1},{\mathrm{Cu}}^{2+}-[\mathrm{Ar}]3{d}^{9}$

${\mathrm{Sc}}^{3+}-[\mathrm{Ar}]3{d}^{0},{\mathrm{Zn}}^{2+}-[\mathrm{Ar}]3{d}^{10}$

$T{i}^{4+}-[\mathrm{Ar}]3{d}^{0}{V}^{2+}-[\mathrm{Ar}]3{d}^{3},$

No d-d transitions in ions with ${d}^{0}$ & ${d}^{10}$ configuration. Therefore they are colourless.

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JEE Main 2022 — Chemistry Inorganic Chemistry

2022mcqmedium

In following pairs, the one in which both transition metal ions are colourless is

Official previous-year question

Held on 29 Jul 2022 · Verified 6 Jul 2026.

Options

A
${\mathrm{Sc}}^{3+},{\mathrm{Zn}}^{2+}$
B
${\mathrm{Ti}}^{4+},{\mathrm{Cu}}^{2+}$
C
${V}^{2+},{\mathrm{Ti}}^{3+}$
D
${\mathrm{Zn}}^{2+},{\mathrm{Mn}}^{2+}$

Did you get this right?

Solution

$d$ -block elements form coloured ions due to presence of unpaired electrons in them. since there are no unpaired electrons in ${\mathrm{Sc}}^{3+}$ and ${\mathrm{Zn}}^{2+}$ ions, they are colourless.

No of unpaired ${e}^{-}$

${\mathrm{Ti}}^{3+}-[\mathrm{Ar}]3{d}^{1},{\mathrm{Cu}}^{2+}-[\mathrm{Ar}]3{d}^{9}$

${\mathrm{Sc}}^{3+}-[\mathrm{Ar}]3{d}^{0},{\mathrm{Zn}}^{2+}-[\mathrm{Ar}]3{d}^{10}$

$T{i}^{4+}-[\mathrm{Ar}]3{d}^{0}{V}^{2+}-[\mathrm{Ar}]3{d}^{3},$

No d-d transitions in ions with ${d}^{0}$ & ${d}^{10}$ configuration. Therefore they are colourless.

JEE Main 2022 — Chemistry Inorganic Chemistry

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JEE Main 2022 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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Physical Chemistry

Organic Chemistry

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