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FeSO4 is used in brown ring test for nitrates and nitrites In this test, a freshly prepared FeSO4 solution solution is mixed with solution containing NO2 and NO3 and the conc, H2SO4 is run down the side of the test tube. If the mixture gets hot or is shaken,
(I) the brown colour disappear (II) NO is evolved
(III) a yellow solution of Fe2(SO4)3

A
I,II,III correct
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B
I,III correct
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C
II,III correct
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D
only I correct
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Solution

The correct option is A I,II,III correct
The brown ring is formed due to presence of brown coloured double compound nitroso ferrous sulphate Fe(NO)SO4
FeSO4+NOfromnitratesFe(NO)SO4brownring
When the mixture is shaken or if it gets hot, the complex breaks to form a yellow solution of Fe2(SO4)3.
Hence, the brown colour disappears and NO is evolved.

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