Indicator use to develop colour at the end of process in the limit test of lead is? * 1 point Phenolphthalein Phenol red Starch Mucilage Sudan red
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Phenolphthalein
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Dithizone is green in color in chloroform and lead-dithizone complex is violet in color, so the resulting color at the end of process is red.
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Limit Test of Lead.
Test sample Standard compound
Extract with 5 ml of dithizone until it becomes green Extract with 5 ml of dithizone until it becomes green
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