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Question

The transition metal ions responsible for color in Ruby and Emerald are, respectively :
  1. Co3+ and Co3+
  2. Cr3+ and Cr3+
  3. Cr3+ and Co3+
  4. Co3+ and Cr3+

A
Co3+ and Cr3+
B
Cr3+ and Co3+
C
Co3+ and Co3+
D
Cr3+ and Cr3+
Solution
Verified by Toppr

Ruby is Al2O3 in which Red colour is obtained when Cr+3 is replacing Al+3 ions in octahedral sites.

Emerald is Be3Al2(SiO3)6 in which green colour is obtained when Cr+3 is replacing Al+3 in octahedral site.

Hence, the correct option is C.

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Q5
Match the metal ions given in Column I with the spin magnetic moments of the ions given in Column II and assign the correct code :

Column I
Column II
a.Co3+i.8B.M.
b.Cr3+ii.35B.M.
c.Fe3+iii.3B.M.
d.Ni2+iv.24B.M.
v.15B.M.

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