Q32 / 160 · AP EAMCET 2022 (05 Jul Shift 2) · Chemistry

In ruby and emerald, the metal ion(s) present is/are

  • A
    $\mathrm{Cr}^{6+}, \mathrm{Mn}^{3+}$
  • Correct answer
    B
    $\mathrm{Cr}^{3+}$
  • C
    $\mathrm{Mn}^{3+}, \mathrm{Co}^{3+}$
  • D
    $\mathrm{Co}^{3+}$

Solution

Ruby is $\mathrm{Al}_2 \mathrm{O}_3$ in which red colour is obtained when $\mathrm{Cr}^{3+}$ replaces $\mathrm{Al}^{3+}$ ions in octahedral sites. Emerald is $\mathrm{Be}_3 \mathrm{Al}_2\left(\mathrm{SiO}_3\right)_6$ in which green colour is obtained when $\mathrm{Cr}^{3+}$ replaces $\mathrm{Al}^{3+}$.

Hence, the correct answer is option: 'B'.

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