Answer :

Ring test is used to detect the presence of nitrate ions (NO3-) in chemistry qualitative analysis. The required chemical reactions involved for the Ring test' is:

i) NO3- + conc.H2SO4 HSO4- + HNO3

ii) 2HNO3 2NO + H2O + 3O

iii) 6FeSO4 + 3O+ 3H2SO 4 3Fe2(SO4)3 + 3H2O

iv) 6FeSO4 + 2HNO3 + 3H2SO4 3Fe2(SO4)3 + 2NO +4H2O

v) FeSO4 + NO + 5H2O

Brown ring is formed at the junction of the layers of the solution and sulphuric acid is obtained, which confirms the presence of nitrate ions in the solution.

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