1.

What happens when concentrated H_(2)SO_(4) is slowly added to a mixture of solution of NaNO_(3) and FeSO_(4)?

Answer»

Green ring of `Fe(SO_(4))_(3)` is formed.
Browing ring of `[Fe(H_(2)O)_5NO]SO_(4)` is formed
Brown ring of `Fe_(2) (SO_(4))_(3)` is formed.
None of these

Solution :When conc. `H_2SO_4` is added slowly down the SIDE of the test tube contianing solution of `NaNO_3` and `FeSO_4`, a brown ring is formed at the BOTTOM layer of tube. This brown ring is due to formation of a complex nitrosoferrous sulphate.
`NaNO_3 + H_2SO_4 to NaHSO_4 + HNO_3`
`6FeSO_4 + 2HNO_3 + 3H_2SO_4 to 3Fe_2(SO_4)_(3) + 4H_2O + 2NO uarr`
`FeSO_4 + NO + 5 H_2O to underset(("brown ring"))([Fe(H_2O)_(5) NO]SO_4)`


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