Yes,  Definitely 

Your best of four aggregate is good enough to get you a college in Delhi university. Chemistry Hons. Is a popular course of Delhi University and  90% aggregate for OBC category student is likely to give you a seat in North campus and Good colleges of South Campus. 

Some colleges which you can look for are... 

1) Ramjas college,  North campus- Last year the cutoff for chemistry Hons.  For OBC students was 91%.

2)  SGTB Khalsa,  North campus

3) Kirori Mal College,  North campus

4) Shri Venketeshwar college, South campus

5) Hansraj College- One of the prestigious college of Delhi university. There is Less chances of getting a seat there at 90% but keep your eye on the cutoff.