Which of the following is a form of calcium carbonate?I. limestone II. marble III. chalk Iv. egg-shells

All of the options I, II, III, and IV are forms of calcium carbonate. Calcium carbonate is a naturally occurring compound that is commonly found in rocks and minerals. - Limestone is a sedimentary rock made mostly of calcium carbonate. It is often used as a building material, as well as an industrial mineral in the production of cement and other products. - Marble is a metamorphic rock that is formed from the recrystallization of limestone under high temperatures and pressures. It is prized for its beauty and is often used in sculptures and building materials. - Chalk is a soft, white form of calcium carbonate that is commonly used as a writing material. - Eggshells are made mostly of calcium carbonate, which provides the strength and structure needed to protect the egg and its contents. In conclusion, all four options are forms of calcium carbonate.