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  4. Assertion: Fe+3 is not valid for Brown Ring Test. Reason: Because NO3- first convert into NO2-

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Q. Assertion : $\ce{Fe^{+3}$ is not valid for Brown Ring Test.
Reason : Because $\ce{NO_3^{-}}$ first convert into $\ce{NO_2^{-}}$

Solution:

In Brown ring test, $\ce{Fe^{2+}}$ oxidizes to $\ce{Fe^{3+}}$, and $\ce{NO_3^{-}}$ reduces to NO.