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MCQ
Freshly prepared FeSO4 is essential for the brown ring test because:
Unit-18 Qualitative Anaylsis
A old FeSO4 is expensive
B ferrous ions get oxidized to ferric in air
C FeSO4 evaporates on storage
D old FeSO4 turns blue
Explanation

Oxidized Fe3+ ions do not produce the brown ring.

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