What is the nature of the bond between B and O in (C2H5)2OBH3 ?
Covalent
Co - ordinate covalent
Ionic bond
Banana shaped bond
Radioactive metal is :
Li
Ce
Na
Ra
D.
Ra
Elements with atomic number greater than 82 are naturaly ratioactive .
Following pair is separated by yellow ammonium sulphide :
CdS , Bi2S1
Bi2S3 , PbS
PbS , HgS
CdS , Ag2S3