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Study of Compounds - Nitric Acid — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryStudy of Compounds - Nitric Acid1 Mark
Question
why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?
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Answer

A freshly prepared ferrous sulphate solution is used because on exposure to the atmosphere, it is oxidized to ferric sulphate which will not give the brown ring.

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