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Chemistry
The transition metal ions responsible for color in ruby and emerald are, respectively :
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Q. The transition metal ions responsible for color in ruby and emerald are, respectively :
JEE Main
JEE Main 2016
The d-and f-Block Elements
A
$Cr^{3+}$ and $Co^{3+}$
23%
B
$Co^{3+}$ and $Cr^{3+}$
20%
C
$Co^{3+}$ and $Co^{3+}$
10%
D
$Cr^{3+}$ and $Cr^{3+}$
47%
Solution:
Ruby is $Al_2O_3$ in which Red colour is obtained when $Cr^{+3}$ is replacing $Al^{+3}$ ions in octahedral sites. Emerald is $Be_3Al_2 (SiO_3)_6$ in which green colour is obtained when $Cr^{+3}$ is replacing $Al^{+3}$ in octahedral site.