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Question
The chemical used in the brown ring test is ______.
Options
CuSO4
FeSO4
Fe2(SO4)3
ZnSO4
Solution
The chemical used in the brown ring test is FeSO4.
Explanation:
In the brown ring test for nitrates, ferrous sulphate (\[\ce{FeSO4}\]) reacts with concentrated sulphuric acid (\[\ce{H2SO4}\]) and nitrate ions to form a brown ring due to the formation of the \[\ce{Fe(NO)^2+}\] (nitroso iron complex).
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