In the combination of NO3-, Br- and I- present in the mixture, Br- and I- interfere in the ring test for NO3-. These are removed by adding a solution of:
Ag2SO4
Ag2CO3
AgNO3
None of these
As we have learnt,
Ag2SO4 combine with Br- and I- ions giving insoluble AgBr and AgI respectively.
Therefore, Option(1) is correct.
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