NEET 2025 — Chemistry solution

NEET2025Chemistry

Given below are two statements:

Statement I: Ferromagnetism is considered as an extreme form of paramagnetism.

Statement II: The number of unpaired electrons in a Cr $^{2 +}$ ion ( $Z = 24$ ) is the same as that of a Nd $^{3 +}$ ion ( $Z = 60$ ).

In the light of the above statements, choose the correct answer from the options given below:

A
Both Statement I and Statement II are true
B
Both Statement I and Statement II are false
C
Statement I is true but Statement II is false
D
Statement I is false but Statement II is true

Solution

Statement I is true: ferromagnetism is the extreme case of paramagnetism where neighbouring unpaired spins align cooperatively in the same direction.

Statement II is false: Cr $^{2 +}$ has configuration [Ar]3d $^{4}$ → 4 unpaired electrons. Nd $^{3 +}$ has [Xe]4f $^{3}$ → 3 unpaired electrons. They are not the same.

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