An element combines with carbonate ions and present as its respectove carbonate in the earths crust. The element can donate either two or three electrons during chemical reactions and can be removed from unwanted impurities by the magnetic seperation. Identify the element and also find the number of elements donating in this existing carbonate compound.

Element that can donate two or three electrons to form compounds and can be separated by magnetic separation is iron. It is found as its carbonate ore, siderite.

Fe2+ + CO32→ FeCO3


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