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Question
why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test?
Solution
Freshly prepared ferrous sulphate solution is utilised since exposure to air (e.g., keeping in a reagent bottle) causes it to oxidise to ferric sulphate solution. The \[\ce{[NO]}\] molecule will not form an additive compound with ferric sulphate; hence, the brown ring test will not be successful.
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