Na2S : Sodium sulfide
The chemical formula Cr2S3 is for dichromium trisulfide.
MgSO4 is the chemical formula for the compound magnesium sulphate.
The chemical formula K3PO4 is for tripotassium phosphate.
NH4 is the chemical formula of the cation ammonium - (NH4)+.
The correct formula is K2Se. It is an ionic compound: potassium selenide.
The chemical formula Cr2S3 is for dichromium trisulfide.
Silane has the chemical formula SiH4; but silane has covalent bonds.
MgSO4 is the chemical formula for the compound magnesium sulphate.
The chemical formula K3PO4 is for tripotassium phosphate.
NH4 is the chemical formula of the cation ammonium - (NH4)+.
The correct formula is K2Se. It is an ionic compound: potassium selenide.
According to the given chemical formula, the compound is magnesium peroxide. It is an unstable compound in nature though.
CdS, cadmium sulfide.
This chemical formula is for vanadium dihydrogen phosphate.
NaBr, sodium bromide.
BaCl2
NaCN is the chemical formula of sodium cyanide, a very toxic substance.