Mole ConceptHard

Question

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

Options

A.1:1
B.2:3
C.3:2
D.2:5

Solution

Let the oxides be Fe2Ox and Fe2Oy. From question, $x \times 16 = \frac{2}{3} \times y \times 16 \Rightarrow x:y = 2:3$

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