question_answer

Alizarin gives a red colour by mordanting it with the sulphate of a metal. The metal ion involved is

A)                 \[C{{r}^{3+}}\]  

B)                 \[F{{e}^{3+}}\]

C)                 \[A{{l}^{3+}}\]  

D)                 \[S{{n}^{2+}}\]

Correct Answer: C

Solution :

           "Alizarin" is a typical mordant dye gives different colours depending on the metal ion used, for example with \[A{{l}^{+3}}\], alizarin gives a rose red colour.                    Co-ordination compound of alizarin with \[A{{l}^{+3}}\]as follow