The compound formed in the Brown ring test of nitrate is
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a
FeSO4. NO2
b
Fe SO4. Fe (NO3)3
c
Fe H2O5 NOSO4
d
Fe SO4
answer is C.
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Detailed Solution
Mix a few drops of water extract with a freshly prepared FeSO4 solution and power ConC.HNO3 along the sides of the test tubeNaNO3+H2SO4→NaHSO4+HNO36FeSO4+3H2SO4+2HNO3→Fe2SO43+4H2O+2NOFeSO4+NO+5H2O→FeH2O5NOSO4 (Dark Brown ring)