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  4. Which of the following colour is imparted by alizarin dye in the presence of Cr3+ ion?

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

Chemistry in Everyday Life

Solution:

Alizarin gives brown red with $Cr^{3+}$ rose red with $Al^{3+}$, blue with $Ba^{2+}$, violet with $Mg^{2+}$ and red with $Sr^{2+}$ ions.