The mineral haematite is $\mathrm{Fe}_2 \mathrm{O}_3.$ Haematite ore contains unwanted material called gangue in addition to $\mathrm{Fe}_2 \mathrm{O}_3.$ If $5 \mathrm{~kg}$ of ore contains $2.78 \mathrm{~kg}$ of $\mathrm{Fe},$ then what percentage of ore is gangue? $(\mathrm{Fe}=56)$

JEE CHEMISTRY MCQ: SOME BASIC CONCEPTS OF CHEMISTRY

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The mineral haematite is

\mathrm{Fe}_2 \mathrm{O}_3.

Haematite ore contains unwanted material called gangue in addition to

\mathrm{Fe}_2 \mathrm{O}_3.

5 \mathrm{~kg}

of ore contains

2.78 \mathrm{~kg}

\mathrm{Fe},

then what percentage of ore is gangue?

(\mathrm{Fe}=56)

View answer and explanation

Correct option: C

20.6 \%

Option D (20.6%) is correct because it is the percentage of gangue calculated from the mass of iron and the total mass of the ore.