Alizarin gives blue colour by mordantig it with the chloride of a metal. The metal ion is

Options

A. `Cr^(3+)`
B. `Fe^(3+)`
C. `Al^(3+)`
D. `Sn^(2+)`

Answer

C

Explanation

"Alizarin" is a typical mordant dye which gives different colours depending upon the metal ion used, for example with `Al^(+3)`, alizarin gives a rose red colour. Co-ordination compound of alizarin with Al+3as follow