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Why a freshly prepared solution of FeSO4...

Why a freshly prepared solution of `FeSO_4` is used in Lassaigne's test for nitrogen ?

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An old sample of `FeSO_4` on keeping undergoes hydrolysis to form basic ferric sulphate.
`4FeSO_4+2H_2O+O_2rarr2Fe(OH)SO_4`
Te pale yellow colur of `Fe^(+3)` ions interferes with the light green colour usually obtained in Lassaigne's test.
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