A nitrogen oxide that forms "in situ" when di | vedclass

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Question

(B) The reaction described is the Brown Ring Test, which is used to detect the presence of nitrate ions $(NO_3^-)$ in a solution.When dilute $FeSO_4$

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$NO$

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(B) The reaction described is the Brown Ring Test, which is used to detect the presence of nitrate ions $(NO_3^-)$ in a solution.When dilute $FeSO_4$ is added to a solution containing nitrate ions, followed by the careful addition of concentrated $H_2SO_4$, the following reaction occurs:$2NO_3^- + 3Fe^{2+} + 4H^+ \rightarrow 2NO + 3Fe^{3+} + 2H_2O$The nitrogen oxide formed "in situ" is nitric oxide $(NO)$.This $NO$ then reacts with the hydrated ferrous sulfate complex to form the brown-colored complex $[Fe(H_2O)_5(NO)]SO_4$.

$A$ nitrogen oxide that forms "in situ" when dilute $FeSO_4$ is treated with an aqueous solution of nitrate ion and then carefully adding conc. $H_2SO_4$ along the sides of the test tube, is

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