Is used in brown ring test for nitrates and nitrites

CHEMISTRY · Single correct · GCSE · Chemistry · Chemical Analysis · Chemical Analysis

Problem

FeSO4\text{FeSO}_4 is used in brown ring test for nitrates and nitrites. In this test, a freshly prepared FeSO4\text{FeSO}_4 solution is mixed with solution containing NO2−\text{NO}_2^- or NO3−\text{NO}_3^- and the conc. H2SO4\text{H}_2\text{SO}_4 is run down the side of the test tube. If the mixture gets hot or is shaken, - (I) the brown colour disappear - (II) NO is evolved - (III) a yellow solution of Fe2(SO4)3\text{Fe}_2(\text{SO}_4)_3 is formed (1) I, II, III correct (2) I, III correct (3) II, III correct (4) only I correct

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