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Q.

The chief constituent and impurity of the gemstone 'Ruby' respectively are

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a

${Al}_{2} O_{3} and Cu$

b

${CrO}_{3} and Cu$

c

${Cr}_{2} O_{3} and Al$

d

${Al}_{2} O_{3} and Cr$

answer is B.

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Detailed Solution

Chromium (Cr) metal is present in Ruby as an impurity.
Ruby has pink to blood-red color.
It is a gemstone.
It is a variety of the mineral corundum (aluminium oxide).

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