Discussion
Element present in dolomite but absent in limestone :
Answer: C
The element present in dolomite but absent in limestone is Mg.
Limestone is mainly calcium carbonate, CaCO3. Dolomite is calcium magnesium carbonate, CaMg(CO3)2, formed when magnesium replaces part of the calcium in a carbonate rock.
Carbon, calcium and oxygen occur in both minerals, since both are carbonates of calcium, so only magnesium distinguishes dolomite.
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