In order to get admission in Delhi University for M.SC Chemistry you should have B.Sc. (Gen or hons) with 60% or above marks in aggregate and 60% or above marks in Chemistry. You must have passed 10+2 (Senior Secondary) or equivalent examination recognized by the University and B.Sc.  with Mathematics as one of the Subjects. For further detail you can go through with given below link.

DU Admission M.Sc Chemistry Eligibility

Good Luck!