Which one of the following materials contains calcium?

సమాధానం చూపించు & వివరణ

సమాధానం: (C) Gypsum

వివరణ

Gypsum is hydrated calcium sulphate (CaSO4·2H2O). China clay is kaolinite (aluminium silicate), corundum is Al2O3 and talc is magnesium silicate.