The composition of gypsum is CaS04. 2H20, while others are carbonates.  

Beryllium shows anomalous properties with alkaline earth metals, due to its small size.

Freons are Chlorofluorocarbon compounds that contain only carbon, chlorine, and fluorine.

Only the compounds containing peptide bonds gives positive biuret test. Only two compounds Glycylalanine( contains a peptide bond between two amino acid ) and tripeptide( contains two peptide bonds between three amino acids ) gives positive Biuret test. Therefore 2 compounds gives ...Read more