Gemstones, Ruby and sapphire are impure forms of

C a O_{2}

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A l_{2} O_{3}

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F e_{2} O_{3}

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A l_{2} O_{3}

and

F e_{2} O_{3}

respectively

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Solution

The correct option is B $A l_{2} O_{3}$
Many gemstones are impure forms of $A l_{2} O_{3}$ .
Both ruby and sapphire are forms of $A l_{2} O_{3}$ with impurities $C r$ and $C o$ respectively.
These impurities gives colour to the gemstones.

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Ruby and sapphire are gem forms of which mineral?

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