If a salt produces a brown ring in the brown ring test it is a nitrate salt.
True
Brown ring test is used to confirm if a given salt is a nitrate salt or not. First, let us know what is the procedure for the brown ring test. The brown ring test is performed by taking the salt solution in a test tube and by adding an equal amount of freshly prepared ferrous sulphate (FeSO4) solution. The test tube is then held in a slant position and concentrated sulphuric acid is poured along the sides of the test tube. If a brown ring is formed at the junction of two liquids then the given salt is a nitrate salt.
Since we are already told that the salt produced a brown ring in the brown ring test we can be sure that the salt is a nitrate salt. Hence the given statement is true.