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FeSO4 is used in brown ring test for nit...

`FeSO_4` is used in brown ring test for nitrates and nitrites. In this test a freshly prepared `FeSO_4` solution is mixed with eolution containing `NO_(2)^(-) or NO_(3)^(-)` and the conc. `H_2SO_4` is run down the side of the tube. If the mixture gets hot is shaken
I) The brown colour disappear
II) No is evolved
III) A yellow solution of `Fe_(2)(SO_4)_3` is formed

A

I,II,III correct

B

I,III correct

C

II,III correct

D

Only I correct

Text Solution

Verified by Experts

The correct Answer is:
A
On heating brown ring decomposes and `Fe^(+2)` oxidizes to `Fe^(+3)`
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