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 Cr2+ ion (Z = 24) is the same as that of a Nd3+ ion (Z = 60).
In the light of the above statements, choose the correct answer from the options given below :

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

Paramagnetism refers to substances whose atomic magnetic moments are randomly oriented in the absence of an external magnetic field but become aligned with the field when it is applied. Ferromagnetism also involves atomic magnetic moments, but due to a strong exchange interaction they spontaneously align parallel to each other even **without** any external field, producing a permanent magnet. Hence, ferromagnetism can be viewed as a limiting (or extreme) case of paramagnetism where the alignment is complete and self‑sustaining. Therefore, Statement���I is **true**.

**Statement II:** “The number of unpaired electrons in a Cr₂₊ ion (Z = 24) is the same as that of a Nd₃₊ ion (Z = 60).”

To verify this, we examine the electron configurations after ionisation.

1. **Chromium (Cr)** – atomic number 24 Neutral configuration: [Ar] 3d⁵ 4s¹ Removing two electrons to form Cr₂₊ first empties the 4s orbital and then one electron from the 3d set: Cr₂₊ configuration: [Ar] 3d⁴ The 3d⁴ subshell in a high‑spin state contains **four unpaired electrons**.

2. **Neodymium (Nd)** – atomic number 60 Neutral configuration: [Xe] 4f⁴ 6s² Removing three electrons to form Nd₃₊ removes the two 6s electrons and one 4f electron: Nd₃₊ configuration: [Xe] 4f³ The 4f³ subshell has **three unpaired electrons**.

Since Cr₂₊ has 4 unpaired electrons and Nd₃₊ has 3 unpaired electrons, the numbers are **not the same**. Therefore, Statement II is **false**.

Combining the evaluations, the correct choice is: **Statement I is true but Statement II is false**.