question_answer

The transition metal ions responsible for color in ruby and emerald are, respectively :   JEE Main Online Paper (Held On 10 April 2016)

A) \[\text{C}{{\text{r}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{r}}^{\text{3+}}}\]

B) \[\text{C}{{\text{o}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{o}}^{\text{3+}}}\]

C) \[\text{C}{{\text{o}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{r}}^{\text{3+}}}\]         

D) \[\text{C}{{\text{r}}^{\text{3+}}}\,\text{and}\,\,\text{C}{{\text{o}}^{\text{3+}}}\]