The pair of lanthanoid ions which are diamagnetic is (1) Ce4+ and Yb2+ (2) Ce3+ and Eu2+ (3) Gd3+ an

Q: What is NEET?

NEET is a competitive examination conducted in India. This question is from the 2024 NEET Chemistry paper.

Q: How can I prepare for NEET Chemistry?

To prepare for NEET Chemistry, practice previous year questions (PYQs), understand concepts thoroughly, and solve mock tests regularly. This 2024 question covers The d and f-Block Elements topic.

Q: What is the difficulty level of this question?

This NEET 2024 Chemistry question has a medium difficulty level and is marked as an important question.

Q: Where can I find more NEET previous year questions?

You can find more NEET previous year questions on AspirantMitraa. Browse by subject, topic, year, and difficulty level to practice effectively.

Question

The pair of lanthanoid ions which are diamagnetic is (1) Ce4+ and Yb2+ (2) Ce3+ and Eu2+ (3) Gd3+ and Eu3+ (4) Pm3+ and Sm3+

Accepted Answer

Correct Answer: a — Ce4+ and Yb2+Step-by-step Solution:Diamagnetic substances have no unpaired electrons. The electronic configurations of lanthanoid ions:Ce⁴⁺: Ce (Z=58) has [Xe]4f¹5d¹6s²; Ce⁴⁺ loses all 4f, 5d, and 6s electrons → [Xe] (4f⁰) → no unpaired electrons → diamagnetic.Yb²⁺: Yb (Z=70) has [Xe]4f¹⁴6s²; Yb²⁺ loses two 6s electrons → [Xe]4f¹⁴ → fully filled f-subshell → no unpaired electrons → diamagnetic.Ce³⁺: Ce³⁺ has [Xe]4f¹ → 1 unpaired electron → paramagnetic.Eu²⁺: Eu (Z=63) has [Xe]4f⁷6s²; Eu²⁺ has [Xe]4f⁷ → 7 unpaired electrons → paramagnetic.Gd³⁺: Gd (Z=64) has [Xe]4f⁷5d¹6s²; Gd³⁺ has [Xe]4f⁷ → 7 unpaired electrons → paramagnetic.Eu³⁺: Eu³⁺ has [Xe]4f⁶ → 6 unpaired electrons → paramagnetic.Pm³⁺: Pm (Z=61) has [Xe]4f⁵6s²; Pm³⁺ has [Xe]4f⁴ → 4 unpaired electrons → paramagnetic.Sm³⁺: Sm (Z=62) has [Xe]4f⁶6s²; Sm³⁺ has [Xe]4f⁵ → 5 unpaired electrons → paramagnetic.Only Ce⁴⁺ and Yb²⁺ are diamagnetic. Hence, option a is correct.Key Concepts: Lanthanoid electronic configurations, f-orbital filling, diamagnetism vs paramagnetism, relationship between unpaired electrons and magnetic behavior.

The pair of lanthanoid ions which are diamagnetic is (1) Ce4+ and Yb2+ (2) Ce3+ and Eu2+ (3) Gd3+ and Eu3+ (4) Pm3+ and Sm3+

Master NEET with Our Test Series

More Questions from The d and f-Block Elements

Frequently Asked Questions

The pair of lanthanoid ions which are diamagnetic is (1) Ce4+ and Yb2+ (2) Ce3+ and Eu2+ (3) Gd3+ and Eu3+ (4) Pm3+ and Sm3+

Master NEET with Our Test Series

More Questions from The d and f-Block Elements

Frequently Asked Questions