Froth Floatation Explanation In Short

oxygen exist as o2 and sulphure exist as s8 how combustion and destructive distillation of coal are differ from each other? how to contert bromoethene to n-methylethanamine write the iupac name for 2,6 ,14tetra methyl hexadecane and write zigzag formula why there is a drop ionisation energy at boron and oxygen ? write a short note standard hydrogen.