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(A) : Boiling a solution containing Cl^(-),Br^(-) and I^(-) with potassium persulphate, violet and brown vapours appear. (R ) : Br^(-) and I^(-) are oxidised to Br_(2) and I_(2) and Cl^(-) is not oxidised.

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Solution :BENEDICT's solution copper- citrate complex `Cu^(2+)` ION is complexed as thus, is PREVENTED from precipitation as copper (II) HYDROXIDE.


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