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JEE Main levelSingle correct optionDifficulty 2 of 3qa153

Aqueous $FeSO X_{4}$ is added to a solution of a sodium salt followed by dilute (not concentrated) acetic acid; a brown colouration appears immediately. The anion is:

A $NO X_{2} X^{-}$
B $NO X_{3} X^{-}$
C $SO X_{3} X^{2 -}$
D $Br X^{-}$

Answer: A

Nitrite is reduced by

Fe X^{2 +}

even in weak acid, giving NO and the brown

[Fe (H X_{2} O) X_{5} NO] X^{2 +}

. Nitrate needs concentrated

H X_{2} SO X_{4}

for the same reaction.

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