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  4. Assertion: Brown ring test is not valid for Fe+3 ion. Reason: Because NO3- ion first gets converted into NO2- ion.

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Q. Assertion : Brown ring test is not valid for $Fe^{+3}$ ion.
Reason : Because $NO_3^-$ ion first gets converted into $NO_2^-$ ion.

AIIMSAIIMS 2018The p-Block Elements - Part2

Solution:

In brown ring test, Fe2+ ion oxidises to Fe3+ ion, and NO-3ion reduces to NO. Brown ring test is valid for Fe2+ ion.