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Alizarin gives blue colour ley mordating it with the chloride of a metal. The metal ion is :

$(a)\;Ba^{2+} \\ (b)\; Al^{3+} \\(c)\;Cr^{3+} \\ (d)\;Fe^{3+} $

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Depending upon the nature of mordant used, the same dye can give different colours.
Alizarin gives a bright red colour with aluminium and above colours with barium.
Hence a is the correct answer.
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