JEE Main2016Chemistryd and f Block ElementsActual
Which of the following are the transition metal ions responsible for colour in ruby and emerald respectively?
Options
- AC o 3 + and C r 3 +
- BC o 3 + and C o 3 +
- CC r 3 + and C r 3 +
- DC r 3 + and Ag +
Correct answer
C. C r 3 + and C r 3 +
Step-by-step solution
Ruby is A l 2 O 3 in which Red colour is obtained when C r + 3 is replacing A l + 3 ions in octahedral sites. Emerald is B e 3 A l 2 S i O 3 6 in which green colour is obtained when C r + 3 is replacing A l + 3 in octahedral site.