The green colour produced in the borax bead test of a chromium(III) salt is due to -

1. $\mathrm{C}\mathrm{r}{\left(\mathrm{B}{\mathrm{O}}_2\right)}_3$
2. $\mathrm{C}\mathrm{r}\mathrm{B}$
3. $\mathrm{C}{\mathrm{r}}_2{\left({\mathrm{B}}_4{\mathrm{O}}_7\right)}_3$
4. $\mathrm{C}{\mathrm{r}}_2{\mathrm{O}}_3$

Solution

Asked in: JEE Advanced 2019 (Paper 1)

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