Question

Which of the following do not give brown ring test?

• A. Lead nitrate
• B. Lead nitrite
• C. Barium nitrate
• D. Sodium nitrate

Answer 1

Answer: (A), (B), (C)

The correct options are
A Lead nitrate
B Lead nitrite
C Barium nitrate

A common nitrate test, known as the brown ring test can be performed by adding iron sulphate to a solution of nitrate, then slowly adding concentrated sulphuric acid such that the acid forms a layer below the aqueous solution.

When lead nitrate/lead nitrate reacts with $FeS{O}_4$ toform $PbS{O}_4$ participates.while barium nitrate reacts with $FeS{O}_4$ to form $BaS{O}_4$ white precipitates which do not allow formation of brown ring