Interfering redicals interfere the test of :

III group radicals only

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III group radicals or downward

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cations which are present in II group filtrate

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none of the above

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Solution

The correct options are
A III group radicals or downward
B cations which are present in II group filtrate
Interfering radicals are oxalate, tartrate, fluoride, borate and phosphate and they are anionic radicals. They form complex with III group reagent ammonium chloride and ammonium hydroxide.This leads to incomplete precipitation of III group cations and causes immature precipitation of IV and Vgroupcations in alkaline medium

For 1group and 2 group analysis, medium remains acidic (dilute HCl) that’s why they do not interfere then. But for 3 group analysis the medium becomes alkaline by group reagents ammonium chloride and ammonium sulphide. Here interfering radicals come into action and disturb the solubility product of cations which causes their premature or incomplete precipitation.

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