Answer:
On keeping aq. \[FeS{{O}_{4}}\]
solution, it undergoes oxidative-hydrolysis to form basic ferric sulphate
\[4FeS{{O}_{4}}+2\,{{H}_{2}}O+{{O}_{2}}\xrightarrow{\,}\,4Fe(OH)S{{O}_{4}}\]
The pale yellow colour of \[F{{e}^{3+}}\]
ions interferes with the light green colour usually obtained in Lassaigne's test.
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