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JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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The mineral haematite is Fe2O3\mathrm{Fe}_2 \mathrm{O}_3. Haematite ore contains unwanted material called gangue in addition of Fe2O3\mathrm{Fe}_2 \mathrm{O}_3. If 5.0 kg5.0 \mathrm{~kg} of ore contains 2.78 kg2.78 \mathrm{~kg} of Fe\mathrm{Fe}, what per cent of ore is Fe2O3\mathrm{Fe}_2 \mathrm{O}_3?
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Correct option: A
79.4%79.4 \%
Option A (79.4 %) is correct because it accurately calculates the percentage of Fe2O3 in the ore based on the given mass of Fe.

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