59:30

structural organisation in animals 7

29:56

Distillation,fractional distillation

39:54

Lipids or fats

52:35

Simplification Class 4th

29:43

Distillation under reduced pressure, steam distillation

26:04

Analysis of sulphur & phosphorus

52:18

IUPAC name of nitroalkanes, alkyl nitrites, nitrile,amide

34:25

Detection of carbon and hydrogen, and other elements