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JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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Iron forms two oxides. If for the same mass of iron, the mass of oxygen combined in the first oxide is two-third of the mass of oxygen combined in the second oxide, then the ratio of valency of iron in first and second oxide is

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Correct option: B

2: 3

Option B (

2: 3

) is correct because the ratio of oxygen masses is 2:3, implying the ratio of iron valencies is also 2:3 based on the oxide formulas.

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