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  4. Brown ring test is used for detection of which radical ?

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Q. Brown ring test is used for detection of which radical ?

MHT CETMHT CET 2016

Solution:

Brown ring test is used for the detection of nitrate radical.

$2 NaNO _{3}+2 H _{2} SO _{4} \longrightarrow 2 NaHSO _{4}+2 HNO _{3}$

$2 HNO _{3}+6 FeSO _{4}+3 H _{2} SO _{4} \longrightarrow $

$3 Fe _{2}\left( SO _{4}\right)_{3}+2 NO +4 H _{2} O$

$\left[ Fe \left( H _{2} O \right)_{6}\right] SO _{4}+ NO \longrightarrow $

$\underset{\text{(Brown ring)}}{\left[ Fe \left( H _{2} O \right)_{5} NO \right]^{2+} SO _{4}^{2-}+ H _{2} O}$