Statement I: Fe³⁺ is more stable than Fe²⁺

Statement II: Fe³⁺ ion has more number of unpaired electrons than Fe²⁺

Statement I and statement II are true and statement II is correct explanation of statement I

The correct answer is option 1. 

Statement I and statement II are true and statement II is correct explanation of statement I

Statement 1: Fe³⁺ is more stable than Fe²⁺
True – This is generally correct. In aqueous solution and many compounds, Fe³⁺ is more stable due to its higher charge density and a half-filled 3d⁵ configuration, which is relatively more stable due to symmetrical distribution and exchange energy.

Statement 2: Fe³⁺ ion has more number of unpaired electrons than Fe²⁺
True – Electronic configurations:

Fe (Z = 26): [Ar] 3d⁶ 4s²

Fe²⁺: [Ar] 3d⁶ → 4 unpaired electrons

Fe³⁺: [Ar] 3d⁵ → 5 unpaired electrons (all single in each d orbital)

So, Fe³⁺ has more unpaired electrons (5) than Fe²⁺ (4).

Final Answer:
Both statements are true, and statement 2 is the correct explanation of statement 1.