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QJEEM16Chb50f: JEE Main 2016 Chemistry - Class 12 JEEM16Chb50f Solution: The transition metal ions responsible for color in ruby and…
The transition metal ions responsible for color in ruby and emerald are, respectively :
Multiple Choice Options
- A Cr3+ and Co3+
- B Co3+ and Cr3+
- C Co3+ and Co3+
- D Cr3+ and Cr3+
Step-by-Step Verified Solution
On addition of impurities to the colourless gemstones, brilliant colours are produced. On addition of chromium to colourless corundum (Al2O3), a red ruby is formed. Red colour ruby is obtained when Cr3+ ions replace Al3+ ions in the octahedral sites of corundum. A green emerald emerges when chromium is added to colourless beryl (Be3Al2(SiO3)6). Green colour emerald is obtained when Cr3+ ions replace Al3+ in the octahedral site of beryl.