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Why is Freshly Prepared Ferrous Sulphate Solution Used for Testing the Nitrate Radical in the Brown Ring Test? - Chemistry

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Short Note

why is freshly prepared ferrous sulphate solution used for testing the nitrate radical in the brown ring test? 

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Solution

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.

Concept: Laboratory Preparation of Nitric Acid
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APPEARS IN

Selina Concise Chemistry Class 10 ICSE
Chapter 10 Study of Compounds - Nitric Acid
Exercise 10 | Q 4.2 | Page 171
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