Question

why deep reddish purple colour is develope in iron limit test​

Answer 1

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Limit test of Iron is based on the reaction of iron in ammonical solution with thioglycollic acid in presence of citric acid to form iron thioglycolate which is pale pink to deep reddish purple in color.

$\bold{\underline\purple{Hope \: that \: helps}}$

Answer 2

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Principle: Limit test of Iron is based on the reaction of iron in ammonical solution with thioglycollic acid in presence of citric acid to form iron thioglycolate which is pale pink to deep reddish purple in color.