Q.1
Solubility of Fe(III) oxides decreases in the order:
(A) . a-Fe203 (Hematite)
(B) . a-FeOOH (Ggoethite)
(C) . y-Fe203 (Maghemite
(D) . y-FeOOH (Lepidocrocite)
Choose the correct answer from the options given below:
- Thermodynamic Stability & Solubility Order: Among trivalent iron [Fe(III)] oxides and oxyhydroxides in soil, solubility is inversely proportional to crystalline stability and aging.
- Solubility Sequence: Maghemite ($\gamma\text{-Fe}_2\text{O}_3$, C) is metastable and most soluble > Lepidocrocite ($\gamma\text{-FeOOH}$, D) > Hematite ($\alpha\text{-Fe}_2\text{O}_3$, A) > Goethite ($\alpha\text{-FeOOH}$, B), which has the lowest solubility and highest thermodynamic stability under temperate and moist soil conditions.
- Conclusion: Solubility decreases in the order (C) > (D) > (A) > (B). (Correct answer: Option 4)
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