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JEE Main 2026 Chemistry question

ChemistrySome Basic Concepts of ChemistryJEE Main 2026

An oxide of iron contains 69.9% iron, its empirical formula, is: (Given: Molar mass of Fe and O are 56 and 16 g mol⁻¹ respectively.)

Answer: (B)

Solution

Moles Fe=69.9/56=1.248; moles O=30.1/16=1.881. Ratio Fe:O=1:1.51≈2:3, so the formula is Fe₂O₃.

Question ID VK-015685