The substance not likely to contain CaCO3 is

• s-Block

The substance not likely to contain CaCO₃ is

1. a marble statue
2. sea shells
3. dolomite
4. calcined gypsum

Answer

The composition of gypsum is CaSO₄.2H₂O. It does not have CaCO₃.

Marble is composed of recrystallized carbonate minerals, most commonly calcite (CaCO₃) or dolomite (CaMa(CO₃)₂).

The correct option is D.