JEE Main 2024 — Chemistry Inorganic Chemistry

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Diamagnetic Lanthanoid ions are:

Official previous-year question

Held on 30 Jan 2024 · Verified 6 Jul 2026.

Options

A
${\mathrm{Nd}}^{3+}$ and ${\mathrm{Eu}}^{3+}$
B
${\mathrm{La}}^{3+}$ and ${\mathrm{Ce}}^{4+}$
C
${\mathrm{Nd}}^{3+}$ and ${\mathrm{Ce}}^{4+}$
D
${\mathrm{Lu}}^{3+}$ and ${\mathrm{Eu}}^{3+}$

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Solution

Lanthanide ion with no unpaired electron is diamagnetic in nature.

Lanthanoid is also called lanthanide, which can be defined as any of the series of $15$ consecutive chemical elements in the periodic table from lanthanum to lutetium (atomic numbers $57-71$ ). With the elements scandium and yttrium, they make up the rare-earth metals. Lanthanides are also radioactive in nature.

$\mathrm{Ce}:[\mathrm{Xe}]4{f}^{1}5{d}^{1}6{s}^{2};{\mathrm{Ce}}^{4+}$ diamagnetic

$\mathrm{La}:[\mathrm{Xe}]4{f}^{0}5{d}^{1}6{s}^{2};{\mathrm{La}}^{3+}$ diamagnetic

Hence, the answer is option B.

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JEE Main 2024 — Chemistry Inorganic Chemistry

2024mcqeasy

Diamagnetic Lanthanoid ions are:

Official previous-year question

Held on 30 Jan 2024 · Verified 6 Jul 2026.

Options

A
${\mathrm{Nd}}^{3+}$ and ${\mathrm{Eu}}^{3+}$
B
${\mathrm{La}}^{3+}$ and ${\mathrm{Ce}}^{4+}$
C
${\mathrm{Nd}}^{3+}$ and ${\mathrm{Ce}}^{4+}$
D
${\mathrm{Lu}}^{3+}$ and ${\mathrm{Eu}}^{3+}$

Did you get this right?

Solution

Lanthanide ion with no unpaired electron is diamagnetic in nature.

$\mathrm{Ce}:[\mathrm{Xe}]4{f}^{1}5{d}^{1}6{s}^{2};{\mathrm{Ce}}^{4+}$ diamagnetic

$\mathrm{La}:[\mathrm{Xe}]4{f}^{0}5{d}^{1}6{s}^{2};{\mathrm{La}}^{3+}$ diamagnetic

Hence, the answer is option B.

Your note

JEE Main Inorganic Chemistry in other years

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JEE Main 2024 — Chemistry Inorganic Chemistry

Options

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Solution

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JEE Main Inorganic Chemistry in other years

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JEE Main 2024 — Chemistry Inorganic Chemistry

Options

Did you get this right?

Solution

Your note

JEE Main Inorganic Chemistry in other years

More JEE Main Inorganic Chemistry questions

Other Chemistry topics for JEE Main

Physical Chemistry

Organic Chemistry

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