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A certain mixed oxide of iron contains 2...

A certain mixed oxide of iron contains 2.5 grams of oxygen for every 7.0 grams of iron. If it is regarded as a mixture of FeO and `Fe_(2)O_(3)` in the weight ratio a : b, what is a : b, (atomic weight of iron = 56)

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The correct Answer is:
`1:2`
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