Question

FeSO₄ forms brown ring with
(a) NO₃
(b) NO₂
(c) NO
(d) N₂O₃

Answer 1

Dear Student,

◆ Answer - (C)

FeSO₄ forms brown ring with NO.

● Explanation -

• Brown ring test is used for detection of nitrate of solution.
• FeSO4 is added to nitrate and conc.H2SO4 is added slowly from the side.
• Brown ring is formed by formation of iron complex [Fe(H2O)5(NO)]SO4.
• Reaction is as follows -

[Fe(H2O)6]SO4 + NO --> [Fe(H2O)5(NO)]SO4 + H2O

Thanks dear. Hope this helps you...