Question

The percentage of Cr(III) in Ruby is

• A. 0.5 to 1 \%
• B. 1 to 2 \%
• C. 0.1 to 0.4 \%
• D. 2 to 3 \%
• E. 0.1 to 0.3 \%

Hint:

Chromium (Cr) is the element responsible for the red color in ruby, with its content typically ranging from 0.5% to 1\%.

Answer 1

The Correct Option is A

Ruby is a gemstone composed of corundum (Al₂O₃), where small amounts of chromium (Cr) are incorporated into the crystal lattice, giving the gemstone its characteristic red color.
- The percentage of chromium in ruby is typically between 0.5\% and 1\% by weight. The chromium atoms are responsible for the red color due to the absorption of certain wavelengths of light.
Thus, the correct answer is (A) 0.5 to 1 \%.