The aqueous solution of salt with MgSO4 solution gives no precipitation in cold, but on heating, it gives white precipitation. The salt contains the acid radical:
C2O42-
SO42-
HCO3-
CO32-
As we have learnt,
Bicarbonates do not give precipitation in cold with MgSO4 but on heating, they form a white precipitate. The reactions occur as follows:
soluble white ppt.
Therefore, Option(3) is correct.
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