Question

Which of the following colour is imparted by alizarin dye in the presence of $C{r}^{3+}$ ion?

• A. Violet
• B. Brown-red
• C. Pink
• D. Red

Answer 1

Answer: (B)

Alizarin gives brown red with $C{r}^{3+}$ rose red with $A{l}^{3+}$, blue with $B{a}^{2+}$, violet with $M{g}^{2+}$ and red with $S{r}^{2+}$ ions.