Q

Which of the following is NOT the combined form of Carbon?

ALP CBT-1, 13-Aug-18 S-3 2018
✓ Answer: C Diamond
Diamond is NOT a combined form of carbon because diamond is an allotrope (free/elemental form) of carbon, not a compound. Chalk and marble contain carbon in combined form mainly as calcium carbonate (CaCO3), so they are carbon compounds. Dolomite contains carbon in combined form as calcium magnesium carbonate, CaMg(CO3)2, so it is also a carbon compound.
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