The brown ring test for nitrates depends on

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Accepted Answer

Correct answer: A. (a) : The brown ring is appeared due to the formation of a brown complex between nitric oxide (formed as a result of reduction of the nitrate ion by the Fe^2+ ions) and Fe^2+ ions. NO_3 ( aq )^-+3 Fe^2+ _ ( aq )+4H^+ _ ( aq ) NO_ (g )+3 Fe_ ( aq )^3++2H_2O_ (l ) Fe^2+ _ ( aq )+ NO_ (g )+5H_2O_ (l ) ( Fe (H_2O )_5 NO^+ )^2+ _ ( aq ) Pentaaquanitrosonium iron (I) (Brown complex)

$The brown ring test for nitrates depends on$

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