Chemistry

Problem

\text{FeSO}_4

is used in brown ring test for nitrates and nitrites. In this test, a freshly prepared

\text{FeSO}_4

solution is mixed with solution containing

\text{NO}_2^-

\text{NO}_3^-

and the conc.

\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

\text{Fe}_2(\text{SO}_4)_3

is formed a. I, II, III correct b. I, III correct c. II, III correct d. only I correct

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